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                    1Two Sum – Medium
            
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                    3  Longest Substring Without Repeating Characters
            
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                    4 Median of Two Sorted Arrays
            
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                    5 Longest Palindromic Substring
            
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                    6 ZigZag Conversion – Easy
            
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                    7 Reverse Integer – Easy
            
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                    8 String to Integer (atoi) – Easy
            
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                    10 Regular Expression Matching
            
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                    11  Container With Most Water – Medium
            
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                    12 Integer to Roman – Medium
            
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                    13 Roman to Integer – Easy
            
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                    14 Longest Common Prefix – Easy
            
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                    15 3Sum – Medium
            
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                    16 3Sum Closest – Medium
            
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                    17 Letter Combinations of a Phone Number – Medium
            
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                    18 4Sum – Medium
            
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                    19 Remove Nth Node From End of List – Easy
            
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                    20 Valid Parentheses – Easy
            
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                    21 Merge Two Sorted Lists – Easy
            
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                    22 Generate Parentheses – Medium
            
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                    23 Merge k Sorted Lists
            
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                    24 Swap Nodes in Pairs – Medium
            
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                    25 Reverse Nodes in k-Group
            
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                    26 Remove Duplicates from Sorted Array – Easy
            
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                    28 Implement strStr() – Easy
            
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                    29 Divide Two Integers – Medium
            
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                    31 Next Permutation – Medium
            
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                    33 Search in Rotated Sorted Array – Hard
            
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                    34 Search for a Range – Medium
            
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                    35 Search Insert Position – Medium
            
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                    36 Valid Sudoku – Easy
            
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                    37 Sudoku Solver
            
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                    38 Count and Say – Easy
            
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                    39  Combination Sum – Medium
            
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                    40 Combination Sum II – Medium
            
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                    42 Trapping Rain Water
            
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                    43  Multiply Strings – Medium
            
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                    44 Wildcard Matching
            
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                    46  Permutations – Medium
            
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                    47  Permutations II – Medium
            
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                    48 Rotate Image – Medium
            
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                    49  Group Anagrams – Medium
            
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                    50 Pow(x, n) – Medium
            
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                    Solutions 51 - 100
            
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                    53 Maximum Subarray – Medium
            
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                    54 Spiral Matrix – Medium
            
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                    55 Jump Game – Medium
            
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        <li class="chapter " data-level="1.3.4" data-path="56-merge-intervals.html">
            
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                    56 Merge Intervals
            
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        <li class="chapter " data-level="1.3.5" data-path="56-merge-intervals/57-insert-interval.html">
            
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                    57 Insert Interval
            
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        <li class="chapter " data-level="1.3.6" data-path="58_length_of_last_word__easy.html">
            
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                    58 Length of Last Word – Easy
            
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        <li class="chapter " data-level="1.3.7" data-path="59_spiral_matrix_ii__medium.html">
            
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                    59 Spiral Matrix II – Medium
            
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        <li class="chapter " data-level="1.3.8" data-path="60_permutation_sequence__medium.html">
            
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                    60 Permutation Sequence – Medium
            
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        <li class="chapter " data-level="1.3.9" data-path="61_rotate_list__medium.html">
            
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                    61 Rotate List – Medium
            
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        <li class="chapter " data-level="1.3.10" data-path="62_unique_paths__medium.html">
            
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                    62 Unique Paths – Medium
            
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        <li class="chapter " data-level="1.3.11" data-path="62_unique_paths_ii__medium.html">
            
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                    63 Unique Paths II – Medium
            
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        <li class="chapter " data-level="1.3.12" data-path="64_minimum_path_sum__medium.html">
            
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                    64 Minimum Path Sum – Medium
            
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        <li class="chapter " data-level="1.3.13" data-path="65-valid-number.html">
            
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                    65 Valid Number
            
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        <li class="chapter " data-level="1.3.14" data-path="66_plus_one__easy.html">
            
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                    66 Plus One – Easy
            
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        <li class="chapter " data-level="1.3.15" data-path="67_add_binary__easy.html">
            
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                    67 Add Binary – Easy
            
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        <li class="chapter " data-level="1.3.16" data-path="68-text-justification.html">
            
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                    68 Text Justification
            
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        <li class="chapter " data-level="1.3.17" data-path="69_sqrtx__medium.html">
            
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                    69 Sqrt(x) – Medium
            
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                    70 Climbing Stairs – Easy
            
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        <li class="chapter " data-level="1.3.19" data-path="71_simplify_path__medium.html">
            
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                    71 Simplify Path – Medium
            
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        <li class="chapter " data-level="1.3.20" data-path="73_set_matrix_zeroes__medium.html">
            
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                    73 Set Matrix Zeroes – Medium
            
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        <li class="chapter " data-level="1.3.21" data-path="74_search_a_2d_matrix__medium.html">
            
                <a href="74_search_a_2d_matrix__medium.html">
            
                    
                    74 Search a 2D Matrix – Medium
            
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        <li class="chapter " data-level="1.3.22" data-path="75_sort_colors__medium.html">
            
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                    75 Sort Colors – Medium
            
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        <li class="chapter " data-level="1.3.23" data-path="76-minimum-window-substring.html">
            
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                    76 Minimum Window Substring
            
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        <li class="chapter " data-level="1.3.24" data-path="77_combinations__medium.html">
            
                <a href="77_combinations__medium.html">
            
                    
                    77 Combinations – Medium
            
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        <li class="chapter " data-level="1.3.25" data-path="78_subsets__medium.html">
            
                <a href="78_subsets__medium.html">
            
                    
                    78 Subsets – Medium
            
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        <li class="chapter " data-level="1.3.26" data-path="79_word_search__medium.html">
            
                <a href="79_word_search__medium.html">
            
                    
                    79 Word Search – Medium
            
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        <li class="chapter " data-level="1.3.27" data-path="80_remove_duplicates_from_sorted_array_ii__medium.html">
            
                <a href="80_remove_duplicates_from_sorted_array_ii__medium.html">
            
                    
                    80 Remove Duplicates from Sorted Array II – Medium
            
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        <li class="chapter " data-level="1.3.28" data-path="81_leetcode_java_search_in_rotated_sorted_array_ii.html">
            
                <a href="81_leetcode_java_search_in_rotated_sorted_array_ii.html">
            
                    
                    81 Search in Rotated Sorted Array II
            
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        <li class="chapter " data-level="1.3.29" data-path="82_leetcode_java_remove_duplicates_from_sorted_lis.html">
            
                <a href="82_leetcode_java_remove_duplicates_from_sorted_lis.html">
            
                    
                    82 Remove Duplicates from Sorted List II – Medium
            
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        <li class="chapter " data-level="1.3.30" data-path="83_leetcode_java_remove_duplicates_from_sorted_lis.html">
            
                <a href="83_leetcode_java_remove_duplicates_from_sorted_lis.html">
            
                    
                    83  Remove Duplicates from Sorted List – Easy
            
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        <li class="chapter " data-level="1.3.31" data-path="85-maximal-rectangle.html">
            
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                    85 Maximal Rectangle
            
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        <li class="chapter " data-level="1.3.32" data-path="86_partition_list__medium.html">
            
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                    86 Partition List – Medium
            
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        <li class="chapter " data-level="1.3.33" data-path="88_merge_sorted_array.html">
            
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                    88 Merge Sorted Array
            
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        <li class="chapter " data-level="1.3.34" data-path="89_gray_code__medium.html">
            
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                    89 Gray Code – Medium
            
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        <li class="chapter " data-level="1.3.35" data-path="90_subsets_ii__medium.html">
            
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                    90 Subsets II – Medium
            
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        <li class="chapter " data-level="1.3.36" data-path="91_decode_ways__medium.html">
            
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                    91 Decode Ways – Medium
            
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        <li class="chapter " data-level="1.3.37" data-path="92_reverse_linked_list_ii__medium.html">
            
                <a href="92_reverse_linked_list_ii__medium.html">
            
                    
                    92 Reverse Linked List II – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.3.38" data-path="93_restore_ip_addresses__medium.html">
            
                <a href="93_restore_ip_addresses__medium.html">
            
                    
                    93 Restore IP Addresses – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.3.39" data-path="94_binary_tree_inorder_traversal__medium.html">
            
                <a href="94_binary_tree_inorder_traversal__medium.html">
            
                    
                    94 Binary Tree Inorder Traversal – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.3.40" data-path="95_unique_binary_search_trees_ii__medium.html">
            
                <a href="95_unique_binary_search_trees_ii__medium.html">
            
                    
                    95 Unique Binary Search Trees II – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.3.41" data-path="98-validate-binary-search-tree.html">
            
                <a href="98-validate-binary-search-tree.html">
            
                    
                    98 Validate Binary Search Tree
            
                </a>
            

        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.4" data-path="solutions_101_-_150.html">
            
                <a href="solutions_101_-_150.html">
            
                    
                    Solutions 101 - 150
            
                </a>
            

            <ul class="articles">
                
    
        <li class="chapter " data-level="1.4.1" data-path="101_symmetric_tree__easy.html">
            
                <a href="101_symmetric_tree__easy.html">
            
                    
                    101 Symmetric Tree – Easy
            
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        </li>
    
        <li class="chapter " data-level="1.4.2" data-path="102_binary_tree_level_order_traversal__easy.html">
            
                <a href="102_binary_tree_level_order_traversal__easy.html">
            
                    
                    102 Binary Tree Level Order Traversal – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.3" data-path="103-binary-tree-zigzag-level-order-traversal.html">
            
                <a href="103-binary-tree-zigzag-level-order-traversal.html">
            
                    
                    103 Binary Tree Zigzag Level Order Traversal
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.4" data-path="104_maximum_depth_of_binary_tree__easy.html">
            
                <a href="104_maximum_depth_of_binary_tree__easy.html">
            
                    
                    104 Maximum Depth of Binary Tree – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.5" data-path="105_construct_binary_tree_from_preorder_and_inorde.html">
            
                <a href="105_construct_binary_tree_from_preorder_and_inorde.html">
            
                    
                    105 Construct Binary Tree from Preorder and Inorder Traversal – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.6" data-path="106_construct_binary_tree_from_inorder_and_postord.html">
            
                <a href="106_construct_binary_tree_from_inorder_and_postord.html">
            
                    
                    106 Construct Binary Tree from Inorder and Postorder Traversal – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.7" data-path="107_binary_tree_level_order_traversal_ii__easy.html">
            
                <a href="107_binary_tree_level_order_traversal_ii__easy.html">
            
                    
                    107 Binary Tree Level Order Traversal II – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.8" data-path="108_convert_sorted_array_to_binary_search_tree__me.html">
            
                <a href="108_convert_sorted_array_to_binary_search_tree__me.html">
            
                    
                    108 Convert Sorted Array to Binary Search Tree – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.9" data-path="109_convert_sorted_list_to_binary_search_tree__med.html">
            
                <a href="109_convert_sorted_list_to_binary_search_tree__med.html">
            
                    
                    109 Convert Sorted List to Binary Search Tree – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.10" data-path="110_balanced_binary_tree__easy.html">
            
                <a href="110_balanced_binary_tree__easy.html">
            
                    
                    110 Balanced Binary Tree – Easy
            
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        </li>
    
        <li class="chapter " data-level="1.4.11" data-path="111minimum_depth_of_binary_tree__easy.html">
            
                <a href="111minimum_depth_of_binary_tree__easy.html">
            
                    
                    111Minimum Depth of Binary Tree – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.12" data-path="112_path_sum__easy.html">
            
                <a href="112_path_sum__easy.html">
            
                    
                    112 Path Sum – Easy
            
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        <li class="chapter " data-level="1.4.13" data-path="113_path_sum_ii__medium.html">
            
                <a href="113_path_sum_ii__medium.html">
            
                    
                    113 Path Sum II – Medium
            
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        </li>
    
        <li class="chapter " data-level="1.4.14" data-path="114_flatten_binary_tree_to_linked_list__medium.html">
            
                <a href="114_flatten_binary_tree_to_linked_list__medium.html">
            
                    
                    114 Flatten Binary Tree to Linked List – Medium
            
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        <li class="chapter " data-level="1.4.15" data-path="116_populating_next_right_pointers_in_each_node__m.html">
            
                <a href="116_populating_next_right_pointers_in_each_node__m.html">
            
                    
                    116 Populating Next Right Pointers in Each Node – Medium
            
                </a>
            

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        <li class="chapter " data-level="1.4.16" data-path="117-populating-next-right-pointers-in-each-node-ii.html">
            
                <a href="117-populating-next-right-pointers-in-each-node-ii.html">
            
                    
                    117 Populating Next Right Pointers in Each Node II
            
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        <li class="chapter " data-level="1.4.17" data-path="118_pascals_triangle__easy.html">
            
                <a href="118_pascals_triangle__easy.html">
            
                    
                    118 Pascal’s Triangle – Easy
            
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        </li>
    
        <li class="chapter " data-level="1.4.18" data-path="119_pascals_triangle_ii__medium.html">
            
                <a href="119_pascals_triangle_ii__medium.html">
            
                    
                    119 Pascal’s Triangle II – Medium
            
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        </li>
    
        <li class="chapter " data-level="1.4.19" data-path="120_triangle__medium.html">
            
                <a href="120_triangle__medium.html">
            
                    
                    120 Triangle – Medium
            
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        <li class="chapter " data-level="1.4.20" data-path="121_best_time_to_buy_and_sell_stock__medium.html">
            
                <a href="121_best_time_to_buy_and_sell_stock__medium.html">
            
                    
                    121 Best Time to Buy and Sell Stock – Medium
            
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        <li class="chapter " data-level="1.4.21" data-path="122_best_time_to_buy_and_sell_stock_ii__medium.html">
            
                <a href="122_best_time_to_buy_and_sell_stock_ii__medium.html">
            
                    
                    122 Best Time to Buy and Sell Stock II – Medium
            
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        <li class="chapter " data-level="1.4.22" data-path="123_best_time_to_buy_and_sell_stock_iii__hard.html">
            
                <a href="123_best_time_to_buy_and_sell_stock_iii__hard.html">
            
                    
                    123 Best Time to Buy and Sell Stock III – Hard
            
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        <li class="chapter " data-level="1.4.23" data-path="125_valid_palindrome__easy.html">
            
                <a href="125_valid_palindrome__easy.html">
            
                    
                    125 Valid Palindrome – Easy
            
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        <li class="chapter " data-level="1.4.24" data-path="127_word_ladder__medium.html">
            
                <a href="127_word_ladder__medium.html">
            
                    
                    127 Word Ladder – Medium
            
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        </li>
    
        <li class="chapter " data-level="1.4.25" data-path="129_sum_root_to_leaf_numbers__medium/128-longest-consecutive-sequence.html">
            
                <a href="129_sum_root_to_leaf_numbers__medium/128-longest-consecutive-sequence.html">
            
                    
                    128 Longest Consecutive Sequence
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.26" data-path="129_sum_root_to_leaf_numbers__medium.html">
            
                <a href="129_sum_root_to_leaf_numbers__medium.html">
            
                    
                    129 Sum Root to Leaf Numbers – Medium
            
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        <li class="chapter " data-level="1.4.27" data-path="130_surrounded_regions__medium.html">
            
                <a href="130_surrounded_regions__medium.html">
            
                    
                    130 Surrounded Regions – Medium
            
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        <li class="chapter " data-level="1.4.28" data-path="131_palindrome_partitioning__medium.html">
            
                <a href="131_palindrome_partitioning__medium.html">
            
                    
                    131 Palindrome Partitioning – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.29" data-path="132_palindrome_partitioning_ii__hard.html">
            
                <a href="132_palindrome_partitioning_ii__hard.html">
            
                    
                    132 Palindrome Partitioning II – Hard
            
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        </li>
    
        <li class="chapter " data-level="1.4.30" data-path="133_clone_graph__medium.html">
            
                <a href="133_clone_graph__medium.html">
            
                    
                    133 Clone Graph – Medium
            
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        <li class="chapter " data-level="1.4.31" data-path="134_gas_station__medium.html">
            
                <a href="134_gas_station__medium.html">
            
                    
                    134 Gas Station – Medium
            
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        <li class="chapter " data-level="1.4.32" data-path="136_single_number__medium.html">
            
                <a href="136_single_number__medium.html">
            
                    
                    136 Single Number – Medium
            
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        <li class="chapter active" data-level="1.4.33" data-path="137_single_number_ii__medium.html">
            
                <a href="137_single_number_ii__medium.html">
            
                    
                    137 Single Number II – Medium
            
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        </li>
    
        <li class="chapter " data-level="1.4.34" data-path="138-copy-list-with-random-pointer.html">
            
                <a href="138-copy-list-with-random-pointer.html">
            
                    
                    138 Copy List with Random Pointer
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.35" data-path="139_word_break__medium.html">
            
                <a href="139_word_break__medium.html">
            
                    
                    139 Word Break – Medium
            
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        </li>
    
        <li class="chapter " data-level="1.4.36" data-path="140_word_break_ii__hard.html">
            
                <a href="140_word_break_ii__hard.html">
            
                    
                    140 Word Break II – Hard
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.37" data-path="141_linked_list_cycle__medium.html">
            
                <a href="141_linked_list_cycle__medium.html">
            
                    
                    141 Linked List Cycle – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.38" data-path="142_linked_list_cycle_ii__medium.html">
            
                <a href="142_linked_list_cycle_ii__medium.html">
            
                    
                    142 Linked List Cycle II – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.39" data-path="143_reorder_list__medium.html">
            
                <a href="143_reorder_list__medium.html">
            
                    
                    143 Reorder List – Medium
            
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        </li>
    
        <li class="chapter " data-level="1.4.40" data-path="144_binary_tree_preorder_traversal__medium.html">
            
                <a href="144_binary_tree_preorder_traversal__medium.html">
            
                    
                    144 Binary Tree Preorder Traversal – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.41" data-path="145_binary_tree_postorder_traversal__hard.html">
            
                <a href="145_binary_tree_postorder_traversal__hard.html">
            
                    
                    145 Binary Tree Postorder Traversal – Hard
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.42" data-path="146_lru_cache__hard.html">
            
                <a href="146_lru_cache__hard.html">
            
                    
                    146 LRU Cache – Hard
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.43" data-path="147_insertion_sort_list__medium.html">
            
                <a href="147_insertion_sort_list__medium.html">
            
                    
                    147 Insertion Sort List – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.44" data-path="148-sort-list.html">
            
                <a href="148-sort-list.html">
            
                    
                    148 Sort List
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.45" data-path="149-max-points-on-a-line.html">
            
                <a href="149-max-points-on-a-line.html">
            
                    
                    149 Max Points on a Line
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.4.46" data-path="150_evaluate_reverse_polish_notation__medium.html">
            
                <a href="150_evaluate_reverse_polish_notation__medium.html">
            
                    
                    150 Evaluate Reverse Polish Notation – Medium
            
                </a>
            

        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.5" data-path="solutions_151_-_200.html">
            
                <a href="solutions_151_-_200.html">
            
                    
                    Solutions 151 - 200
            
                </a>
            

            <ul class="articles">
                
    
        <li class="chapter " data-level="1.5.1" data-path="151_reverse_words_in_a_string__medium.html">
            
                <a href="151_reverse_words_in_a_string__medium.html">
            
                    
                    151 Reverse Words in a String – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.2" data-path="152_maximum_product_subarray__medium.html">
            
                <a href="152_maximum_product_subarray__medium.html">
            
                    
                    152 Maximum Product Subarray – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.3" data-path="153_find_minimum_in_rotated_sorted_array__medium.html">
            
                <a href="153_find_minimum_in_rotated_sorted_array__medium.html">
            
                    
                    153 Find Minimum in Rotated Sorted Array – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.4" data-path="155_min_stack__easy.html">
            
                <a href="155_min_stack__easy.html">
            
                    
                    155  Min Stack – Easy
            
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        </li>
    
        <li class="chapter " data-level="1.5.5" data-path="156-binary-tree-upside-down-–-medium.html">
            
                <a href="156-binary-tree-upside-down-–-medium.html">
            
                    
                    156 Binary Tree Upside Down – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.6" data-path="157-read-n-characters-given-read4-–-easy.html">
            
                <a href="157-read-n-characters-given-read4-–-easy.html">
            
                    
                    157 Read N Characters Given Read4 – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.7" data-path="158-read-n-characters-given-read4-ii-–-call-multiple-times-add-to-list-questioneditorial-solution-–-hard.html">
            
                <a href="158-read-n-characters-given-read4-ii-–-call-multiple-times-add-to-list-questioneditorial-solution-–-hard.html">
            
                    
                    158 Read N Characters Given Read4 II – Call multiple times Add to List QuestionEditorial Solution – Hard
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.8" data-path="160-intersection-of-two-linked-lists-–-easy/159-longest-substring-with-at-most-two-distinct-characters.html">
            
                <a href="160-intersection-of-two-linked-lists-–-easy/159-longest-substring-with-at-most-two-distinct-characters.html">
            
                    
                    159 Longest Substring with At Most Two Distinct Characters
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.9" data-path="160-intersection-of-two-linked-lists-–-easy.html">
            
                <a href="160-intersection-of-two-linked-lists-–-easy.html">
            
                    
                    160 Intersection of Two Linked Lists – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.10" data-path="161-one-edit-distance-–-medium.html">
            
                <a href="161-one-edit-distance-–-medium.html">
            
                    
                    161 One Edit Distance – Medium
            
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        </li>
    
        <li class="chapter " data-level="1.5.11" data-path="162-find-peak-element-–-medium.html">
            
                <a href="162-find-peak-element-–-medium.html">
            
                    
                    162 Find Peak Element – Medium
            
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        <li class="chapter " data-level="1.5.12" data-path="163-missing-ranges.html">
            
                <a href="163-missing-ranges.html">
            
                    
                    163 Missing Ranges 
            
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        </li>
    
        <li class="chapter " data-level="1.5.13" data-path="165-compare-version-numbers.html">
            
                <a href="165-compare-version-numbers.html">
            
                    
                    165 Compare Version Numbers 
            
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        </li>
    
        <li class="chapter " data-level="1.5.14" data-path="166-fraction-to-recurring-decimal.html">
            
                <a href="166-fraction-to-recurring-decimal.html">
            
                    
                    166  Fraction to Recurring Decimal 
            
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        <li class="chapter " data-level="1.5.15" data-path="167-two-sum-ii-input-array-is-sorted-medium.html">
            
                <a href="167-two-sum-ii-input-array-is-sorted-medium.html">
            
                    
                    167 Two Sum II – Input array is sorted – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.16" data-path="168-excel-sheet-column-title-easy.html">
            
                <a href="168-excel-sheet-column-title-easy.html">
            
                    
                    168 Excel Sheet Column Title – Easy
            
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        </li>
    
        <li class="chapter " data-level="1.5.17" data-path="169-majority-element-easy.html">
            
                <a href="169-majority-element-easy.html">
            
                    
                    169 Majority Element – Easy
            
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        </li>
    
        <li class="chapter " data-level="1.5.18" data-path="170-two-sum-iii-data-structure-design-easy.html">
            
                <a href="170-two-sum-iii-data-structure-design-easy.html">
            
                    
                    170 Two Sum III – Data structure design – Easy
            
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        </li>
    
        <li class="chapter " data-level="1.5.19" data-path="171-excel-sheet-column-number-easy.html">
            
                <a href="171-excel-sheet-column-number-easy.html">
            
                    
                    171 Excel Sheet Column Number – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.20" data-path="172-factorial-trailing-zeroes-easy.html">
            
                <a href="172-factorial-trailing-zeroes-easy.html">
            
                    
                    172 Factorial Trailing Zeroes – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.21" data-path="173-binary-search-tree-iterator-medium.html">
            
                <a href="173-binary-search-tree-iterator-medium.html">
            
                    
                    173 Binary Search Tree Iterator – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.22" data-path="179-largest-number-medium.html">
            
                <a href="179-largest-number-medium.html">
            
                    
                    179 Largest Number – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.23" data-path="186-reverse-words-in-a-string-ii-medium.html">
            
                <a href="186-reverse-words-in-a-string-ii-medium.html">
            
                    
                    186 Reverse Words in a String II – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.24" data-path="187-repeated-dna-sequences-medium.html">
            
                <a href="187-repeated-dna-sequences-medium.html">
            
                    
                    187 Repeated DNA Sequences – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.25" data-path="189-rotate-array-easy.html">
            
                <a href="189-rotate-array-easy.html">
            
                    
                    189 Rotate Array – Easy
            
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        </li>
    
        <li class="chapter " data-level="1.5.26" data-path="190-java-reverse-bits-easy.html">
            
                <a href="190-java-reverse-bits-easy.html">
            
                    
                    190 Java: Reverse Bits – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.27" data-path="191-number-of-1-bits-easy.html">
            
                <a href="191-number-of-1-bits-easy.html">
            
                    
                    191 Number of 1 Bits – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.28" data-path="198-house-robber-easy.html">
            
                <a href="198-house-robber-easy.html">
            
                    
                    198 House Robber – Easy
            
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        </li>
    
        <li class="chapter " data-level="1.5.29" data-path="199-binary-tree-right-side-view-medium.html">
            
                <a href="199-binary-tree-right-side-view-medium.html">
            
                    
                    199 Binary Tree Right Side View – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.5.30" data-path="200-number-of-islands-medium.html">
            
                <a href="200-number-of-islands-medium.html">
            
                    
                    200 Number of Islands – Medium
            
                </a>
            

        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.6" data-path="solutions-201---250.html">
            
                <a href="solutions-201---250.html">
            
                    
                    Solutions 201 - 250
            
                </a>
            

            <ul class="articles">
                
    
        <li class="chapter " data-level="1.6.1" data-path="201-leetcode-java--bitwise-and-of-numbers-range-–-medium.html">
            
                <a href="201-leetcode-java--bitwise-and-of-numbers-range-–-medium.html">
            
                    
                    201 LeetCode Java : Bitwise AND of Numbers Range – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.2" data-path="202-leetcode-java-happy-number-–-easy.html">
            
                <a href="202-leetcode-java-happy-number-–-easy.html">
            
                    
                    202 LeetCode Java: Happy Number – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.3" data-path="203-leetcode-java-remove-linked-list-elements-–-easy.html">
            
                <a href="203-leetcode-java-remove-linked-list-elements-–-easy.html">
            
                    
                    203 LeetCode Java: Remove Linked List Elements – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.4" data-path="204-leetcode-java-count-primes-–-easy.html">
            
                <a href="204-leetcode-java-count-primes-–-easy.html">
            
                    
                    204 LeetCode Java: Count Primes – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.5" data-path="205-leetcode-java-isomorphic-strings-–-easy.html">
            
                <a href="205-leetcode-java-isomorphic-strings-–-easy.html">
            
                    
                    205 LeetCode Java: Isomorphic Strings – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.6" data-path="206-leetcode-java-reverse-linked-list--easy.html">
            
                <a href="206-leetcode-java-reverse-linked-list--easy.html">
            
                    
                    206 LeetCode Java: Reverse Linked List -Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.7" data-path="207-leetcode-java-course-schedule-–-medium.html">
            
                <a href="207-leetcode-java-course-schedule-–-medium.html">
            
                    
                    207 LeetCode Java: Course Schedule – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.8" data-path="208-leetcode-java-implement-trie-prefix-tree-–-medium.html">
            
                <a href="208-leetcode-java-implement-trie-prefix-tree-–-medium.html">
            
                    
                    208 LeetCode Java: Implement Trie (Prefix Tree) – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.9" data-path="209-leetcode-java--minimum-size-subarray-sum-–-medium.html">
            
                <a href="209-leetcode-java--minimum-size-subarray-sum-–-medium.html">
            
                    
                    209 LeetCode Java : Minimum Size Subarray Sum – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.10" data-path="210-leetcode-java-course-schedule-ii-–-medium.html">
            
                <a href="210-leetcode-java-course-schedule-ii-–-medium.html">
            
                    
                    210 LeetCode Java: Course Schedule II – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.11" data-path="211-leetcode-java-add-and-search-word-–-data-structure-design-–-medium.html">
            
                <a href="211-leetcode-java-add-and-search-word-–-data-structure-design-–-medium.html">
            
                    
                    211 LeetCode Java: Add and Search Word – Data structure design – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.12" data-path="212-word-search-ii.html">
            
                <a href="212-word-search-ii.html">
            
                    
                    212 Word Search II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.13" data-path="213-house-robber-ii-medium.html">
            
                <a href="213-house-robber-ii-medium.html">
            
                    
                    213 House Robber II – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.14" data-path="212-word-search-ii/214-shortest-palindrome.html">
            
                <a href="212-word-search-ii/214-shortest-palindrome.html">
            
                    
                    214 Shortest Palindrome
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.15" data-path="215-kth-largest-element-in-an-array-medium.html">
            
                <a href="215-kth-largest-element-in-an-array-medium.html">
            
                    
                    215 Kth Largest Element in an Array – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.16" data-path="216-combination-sum-iii-medium.html">
            
                <a href="216-combination-sum-iii-medium.html">
            
                    
                    216 Combination Sum III – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.17" data-path="217-contains-duplicate-easy.html">
            
                <a href="217-contains-duplicate-easy.html">
            
                    
                    217 Contains Duplicate – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.18" data-path="218-the-skyline-problem.html">
            
                <a href="218-the-skyline-problem.html">
            
                    
                    218 The Skyline Problem
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.19" data-path="219-contains-duplicate-ii-medium.html">
            
                <a href="219-contains-duplicate-ii-medium.html">
            
                    
                    219 Contains Duplicate II – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.20" data-path="220-contains-duplicate-iii-medium.html">
            
                <a href="220-contains-duplicate-iii-medium.html">
            
                    
                    220  Contains Duplicate III – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.21" data-path="221-maximal-square-medium.html">
            
                <a href="221-maximal-square-medium.html">
            
                    
                    221 Maximal Square – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.22" data-path="222-count-complete-tree-nodes-medium.html">
            
                <a href="222-count-complete-tree-nodes-medium.html">
            
                    
                    222 Count Complete Tree Nodes – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.23" data-path="223-rectangle-area-easy.html">
            
                <a href="223-rectangle-area-easy.html">
            
                    
                    223 Rectangle Area – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.24" data-path="218-the-skyline-problem/224-basic-calculator.html">
            
                <a href="218-the-skyline-problem/224-basic-calculator.html">
            
                    
                    224 Basic Calculator
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.25" data-path="225-implement-stack-using-queues-easy.html">
            
                <a href="225-implement-stack-using-queues-easy.html">
            
                    
                    225 Implement Stack using Queues – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.26" data-path="226-invert-binary-tree-easy.html">
            
                <a href="226-invert-binary-tree-easy.html">
            
                    
                    226 Invert Binary Tree – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.27" data-path="227-basic-calculator-ii-medium.html">
            
                <a href="227-basic-calculator-ii-medium.html">
            
                    
                    227 Basic Calculator II – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.28" data-path="228-summary-ranges-medium.html">
            
                <a href="228-summary-ranges-medium.html">
            
                    
                    228 Summary Ranges – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.29" data-path="229-majority-element-ii-medium.html">
            
                <a href="229-majority-element-ii-medium.html">
            
                    
                    229 Majority Element II – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.30" data-path="230-kth-smallest-element-in-a-bst-medium.html">
            
                <a href="230-kth-smallest-element-in-a-bst-medium.html">
            
                    
                    230 Kth Smallest Element in a BST – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.31" data-path="231-power-of-two-easy.html">
            
                <a href="231-power-of-two-easy.html">
            
                    
                    231 Power of Two – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.32" data-path="232-implement-queue-using-stacks-easy.html">
            
                <a href="232-implement-queue-using-stacks-easy.html">
            
                    
                    232 Implement Queue using Stacks – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.33" data-path="234-palindrome-linked-list-easy.html">
            
                <a href="234-palindrome-linked-list-easy.html">
            
                    
                    234 Palindrome Linked List – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.34" data-path="235-lowest-common-ancestor-of-a-binary-search-tree-easy.html">
            
                <a href="235-lowest-common-ancestor-of-a-binary-search-tree-easy.html">
            
                    
                    235 Lowest Common Ancestor of a Binary Search Tree – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.35" data-path="236-lowest-common-ancestor-of-a-binary-tree-medium.html">
            
                <a href="236-lowest-common-ancestor-of-a-binary-tree-medium.html">
            
                    
                    236 Lowest Common Ancestor of a Binary Tree – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.36" data-path="237-delete-node-in-a-linked-list-easy.html">
            
                <a href="237-delete-node-in-a-linked-list-easy.html">
            
                    
                    237 Delete Node in a Linked List – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.37" data-path="238-product-of-array-except-self-medium.html">
            
                <a href="238-product-of-array-except-self-medium.html">
            
                    
                    238 Product of Array Except Self – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.38" data-path="218-the-skyline-problem/239-sliding-window-maximum.html">
            
                <a href="218-the-skyline-problem/239-sliding-window-maximum.html">
            
                    
                    239 Sliding Window Maximum
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.39" data-path="240-search-a-2d-matrix-ii-medium.html">
            
                <a href="240-search-a-2d-matrix-ii-medium.html">
            
                    
                    240 Search a 2D Matrix II – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.40" data-path="241-different-ways-to-add-parentheses-medium.html">
            
                <a href="241-different-ways-to-add-parentheses-medium.html">
            
                    
                    241 Different Ways to Add Parentheses – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.41" data-path="242-valid-anagram-easy.html">
            
                <a href="242-valid-anagram-easy.html">
            
                    
                    242 Valid Anagram – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.42" data-path="243-shortest-word-distance-easy.html">
            
                <a href="243-shortest-word-distance-easy.html">
            
                    
                    243 Shortest Word Distance – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.43" data-path="244-shortest-word-distance-ii-medium.html">
            
                <a href="244-shortest-word-distance-ii-medium.html">
            
                    
                    244 Shortest Word Distance II – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.44" data-path="245-shortest-word-distance-iii-medium.html">
            
                <a href="245-shortest-word-distance-iii-medium.html">
            
                    
                    245 Shortest Word Distance III – Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.45" data-path="246-strobogrammatic-number-easy.html">
            
                <a href="246-strobogrammatic-number-easy.html">
            
                    
                    246 Strobogrammatic Number – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.46" data-path="247-strobogrammatic-number-ii.html">
            
                <a href="247-strobogrammatic-number-ii.html">
            
                    
                    247 Strobogrammatic Number II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.47" data-path="248-leetcode-java-different-ways-to-add-parentheses-–-hard.html">
            
                <a href="248-leetcode-java-different-ways-to-add-parentheses-–-hard.html">
            
                    
                    248 LeetCode Java: Different Ways to Add Parentheses – Hard
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.48" data-path="249-leetcode-java-group-shifted-strings-–-easy.html">
            
                <a href="249-leetcode-java-group-shifted-strings-–-easy.html">
            
                    
                    249 LeetCode Java: Group Shifted Strings – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.6.49" data-path="250-leetcode-java-count-univalue-subtrees-–-medium.html">
            
                <a href="250-leetcode-java-count-univalue-subtrees-–-medium.html">
            
                    
                    250 LeetCode Java: Count Univalue Subtrees – Medium
            
                </a>
            

        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.7" data-path="solutions-251---300.html">
            
                <a href="solutions-251---300.html">
            
                    
                    Solutions 251 - 300
            
                </a>
            

            <ul class="articles">
                
    
        <li class="chapter " data-level="1.7.1" data-path="251-flatten-2d-vector.html">
            
                <a href="251-flatten-2d-vector.html">
            
                    
                    251 Flatten 2D Vector
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.2" data-path="252-leetcode-java-meeting-rooms-–-easy.html">
            
                <a href="252-leetcode-java-meeting-rooms-–-easy.html">
            
                    
                    252 LeetCode Java: Meeting Rooms – Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.3" data-path="253-meeting-rooms-ii---medium.html">
            
                <a href="253-meeting-rooms-ii---medium.html">
            
                    
                    253 Meeting Rooms II - Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.4" data-path="254-factor-combinations---medium.html">
            
                <a href="254-factor-combinations---medium.html">
            
                    
                    254 Factor Combinations - Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.5" data-path="255-verify-preorder-sequence-in-binary-search-tree---medium.html">
            
                <a href="255-verify-preorder-sequence-in-binary-search-tree---medium.html">
            
                    
                    255 Verify Preorder Sequence in Binary Search Tree - Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.6" data-path="256-paint-house---medium.html">
            
                <a href="256-paint-house---medium.html">
            
                    
                    256 Paint House - Medium
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.7" data-path="257-binary-tree-paths---easy.html">
            
                <a href="257-binary-tree-paths---easy.html">
            
                    
                    257 Binary Tree Paths - Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.8" data-path="258-add-digits---easy.html">
            
                <a href="258-add-digits---easy.html">
            
                    
                    258 Add Digits - Easy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.9" data-path="259-3sum-smaller.html">
            
                <a href="259-3sum-smaller.html">
            
                    
                    259 3Sum Smaller
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.10" data-path="260-single-number-iii.html">
            
                <a href="260-single-number-iii.html">
            
                    
                    260 Single Number III
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.11" data-path="261-graph-valid-tree.html">
            
                <a href="261-graph-valid-tree.html">
            
                    
                    261 Graph Valid Tree
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.12" data-path="263-ugly-number.html">
            
                <a href="263-ugly-number.html">
            
                    
                    263 Ugly Number
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.13" data-path="264-ugly-number-ii.html">
            
                <a href="264-ugly-number-ii.html">
            
                    
                    264 Ugly Number II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.14" data-path="266-palindrome-permutation.html">
            
                <a href="266-palindrome-permutation.html">
            
                    
                    266 Palindrome Permutation
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.15" data-path="267-palindrome-permutation-ii.html">
            
                <a href="267-palindrome-permutation-ii.html">
            
                    
                    267 Palindrome Permutation II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.16" data-path="268-missing-number.html">
            
                <a href="268-missing-number.html">
            
                    
                    268 Missing Number
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.17" data-path="268-missing-number/269-alien-dictionary.html">
            
                <a href="268-missing-number/269-alien-dictionary.html">
            
                    
                    269 Alien Dictionary
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.18" data-path="270-closest-binary-search-tree-value.html">
            
                <a href="270-closest-binary-search-tree-value.html">
            
                    
                    270 Closest Binary Search Tree Value
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.19" data-path="271-encode-and-decode-strings.html">
            
                <a href="271-encode-and-decode-strings.html">
            
                    
                    271 Encode and Decode Strings
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.20" data-path="271-encode-and-decode-strings/272-closest-binary-search-tree-value-ii.html">
            
                <a href="271-encode-and-decode-strings/272-closest-binary-search-tree-value-ii.html">
            
                    
                    272 Closest Binary Search Tree Value II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.21" data-path="273-integer-to-english-words.html">
            
                <a href="273-integer-to-english-words.html">
            
                    
                    273 Integer to English Words
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.22" data-path="274-h-index.html">
            
                <a href="274-h-index.html">
            
                    
                    274 H-Index
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.23" data-path="275-h-index-ii.html">
            
                <a href="275-h-index-ii.html">
            
                    
                    275 H-Index II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.24" data-path="276-paint-fence.html">
            
                <a href="276-paint-fence.html">
            
                    
                    276 Paint Fence
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.25" data-path="277-find-the-celebrity.html">
            
                <a href="277-find-the-celebrity.html">
            
                    
                    277 Find the Celebrity
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.26" data-path="278-first-bad-version.html">
            
                <a href="278-first-bad-version.html">
            
                    
                    278 First Bad Version
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.27" data-path="279-perfect-squares.html">
            
                <a href="279-perfect-squares.html">
            
                    
                    279 Perfect Squares
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.28" data-path="280-wiggle-sort.html">
            
                <a href="280-wiggle-sort.html">
            
                    
                    280 Wiggle Sort
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.29" data-path="281-zigzag-iterator.html">
            
                <a href="281-zigzag-iterator.html">
            
                    
                    281 Zigzag Iterator
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.30" data-path="282-expression-add-operators.html">
            
                <a href="282-expression-add-operators.html">
            
                    
                    282 Expression Add Operators
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.31" data-path="283-move-zeroes.html">
            
                <a href="283-move-zeroes.html">
            
                    
                    283 Move Zeroes
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.32" data-path="284-peeking-iterator.html">
            
                <a href="284-peeking-iterator.html">
            
                    
                    284 Peeking Iterator
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.33" data-path="285-inorder-successor-in-bst.html">
            
                <a href="285-inorder-successor-in-bst.html">
            
                    
                    285 Inorder Successor in BST
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.34" data-path="286-walls-and-gates.html">
            
                <a href="286-walls-and-gates.html">
            
                    
                    286 Walls and Gates
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.35" data-path="288-unique-word-abbreviation.html">
            
                <a href="288-unique-word-abbreviation.html">
            
                    
                    288 Unique Word Abbreviation
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.36" data-path="289-game-of-life.html">
            
                <a href="289-game-of-life.html">
            
                    
                    289 Game of Life
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.37" data-path="290-word-pattern.html">
            
                <a href="290-word-pattern.html">
            
                    
                    290 Word Pattern
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.38" data-path="291-word-pattern-ii.html">
            
                <a href="291-word-pattern-ii.html">
            
                    
                    291 Word Pattern II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.39" data-path="292-nim-game.html">
            
                <a href="292-nim-game.html">
            
                    
                    292 Nim Game
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.40" data-path="293-flip-game.html">
            
                <a href="293-flip-game.html">
            
                    
                    293 Flip Game
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.41" data-path="294-flip-game-ii.html">
            
                <a href="294-flip-game-ii.html">
            
                    
                    294 Flip Game II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.42" data-path="295-find-median-from-data-stream.html">
            
                <a href="295-find-median-from-data-stream.html">
            
                    
                    295 Find Median from Data Stream
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.43" data-path="298-binary-tree-longest-consecutive-sequence/297-serialize-and-deserialize-binary-tree.html">
            
                <a href="298-binary-tree-longest-consecutive-sequence/297-serialize-and-deserialize-binary-tree.html">
            
                    
                    297 Serialize and Deserialize Binary Tree
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.44" data-path="298-binary-tree-longest-consecutive-sequence.html">
            
                <a href="298-binary-tree-longest-consecutive-sequence.html">
            
                    
                    298 Binary Tree Longest Consecutive Sequence
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.7.45" data-path="299-bulls-and-cows.html">
            
                <a href="299-bulls-and-cows.html">
            
                    
                    299 Bulls and Cows
            
                </a>
            

        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.8" >
            
                <span>
            
                    
                    Solutions 301 - 350
            
                </span>
            

            <ul class="articles">
                
    
        <li class="chapter " data-level="1.8.1" data-path="303-range-sum-query---immutable/301-remove-invalid-parentheses.html">
            
                <a href="303-range-sum-query---immutable/301-remove-invalid-parentheses.html">
            
                    
                    301 Remove Invalid Parentheses
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.2" data-path="303-range-sum-query---immutable/302-smallest-rectangle-enclosing-black-pixels.html">
            
                <a href="303-range-sum-query---immutable/302-smallest-rectangle-enclosing-black-pixels.html">
            
                    
                    302 Smallest Rectangle Enclosing Black Pixels
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.3" data-path="303-range-sum-query---immutable.html">
            
                <a href="303-range-sum-query---immutable.html">
            
                    
                    303 Range Sum Query - Immutable
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.4" data-path="304-range-sum-query-2d---immutable.html">
            
                <a href="304-range-sum-query-2d---immutable.html">
            
                    
                    304 Range Sum Query 2D - Immutable
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.5" data-path="303-range-sum-query---immutable/305-number-of-islands-ii.html">
            
                <a href="303-range-sum-query---immutable/305-number-of-islands-ii.html">
            
                    
                    305 Number of Islands II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.6" data-path="306-additive-number.html">
            
                <a href="306-additive-number.html">
            
                    
                    306 Additive Number
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.7" data-path="307-range-sum-query---mutable.html">
            
                <a href="307-range-sum-query---mutable.html">
            
                    
                    307 Range Sum Query - Mutable
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.8" data-path="307-range-sum-query---mutable/308-range-sum-query-2d-mutable.html">
            
                <a href="307-range-sum-query---mutable/308-range-sum-query-2d-mutable.html">
            
                    
                    308 Range Sum Query 2D - Mutable
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.9" data-path="309-best-time-to-buy-and-sell-stock-with-cooldown.html">
            
                <a href="309-best-time-to-buy-and-sell-stock-with-cooldown.html">
            
                    
                    309 Best Time to Buy and Sell Stock with Cooldown
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.10" data-path="310-minimum-height-trees.html">
            
                <a href="310-minimum-height-trees.html">
            
                    
                    310 Minimum Height Trees
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.11" data-path="311-sparse-matrix-multiplication.html">
            
                <a href="311-sparse-matrix-multiplication.html">
            
                    
                    311 Sparse Matrix Multiplication
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.12" data-path="311-sparse-matrix-multiplication/312-burst-balloons.html">
            
                <a href="311-sparse-matrix-multiplication/312-burst-balloons.html">
            
                    
                    312 Burst Balloons
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.13" data-path="313-super-ugly-number.html">
            
                <a href="313-super-ugly-number.html">
            
                    
                    313 Super Ugly Number
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.14" data-path="314-binary-tree-vertical-order-traversal.html">
            
                <a href="314-binary-tree-vertical-order-traversal.html">
            
                    
                    314 Binary Tree Vertical Order Traversal
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.15" data-path="303-range-sum-query---immutable/315-count-of-smaller-numbers-after-self.html">
            
                <a href="303-range-sum-query---immutable/315-count-of-smaller-numbers-after-self.html">
            
                    
                    315 Count of Smaller Numbers After Self
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.16" data-path="303-range-sum-query---immutable/316-remove-duplicate-letters.html">
            
                <a href="303-range-sum-query---immutable/316-remove-duplicate-letters.html">
            
                    
                    316 Remove Duplicate Letters
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.17" data-path="318-maximum-product-of-word-lengths/317-shortest-distance-from-all-buildings.html">
            
                <a href="318-maximum-product-of-word-lengths/317-shortest-distance-from-all-buildings.html">
            
                    
                    317 Shortest Distance from All Buildings
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.18" data-path="318-maximum-product-of-word-lengths.html">
            
                <a href="318-maximum-product-of-word-lengths.html">
            
                    
                    318 Maximum Product of Word Lengths
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.19" data-path="319-bulb-switcher.html">
            
                <a href="319-bulb-switcher.html">
            
                    
                    319 Bulb Switcher
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.20" data-path="320-generalized-abbreviation.html">
            
                <a href="320-generalized-abbreviation.html">
            
                    
                    320 Generalized Abbreviation
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.21" data-path="322-coin-change/321-create-maximum-number.html">
            
                <a href="322-coin-change/321-create-maximum-number.html">
            
                    
                    321 Create Maximum Number
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.22" data-path="322-coin-change.html">
            
                <a href="322-coin-change.html">
            
                    
                    322 Coin Change
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.23" data-path="323-number-of-connected-components-in-an-undirected-graph.html">
            
                <a href="323-number-of-connected-components-in-an-undirected-graph.html">
            
                    
                    323 Number of Connected Components in an Undirected Graph
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.24" data-path="324-wiggle-sort-ii.html">
            
                <a href="324-wiggle-sort-ii.html">
            
                    
                    324 Wiggle Sort II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.25" data-path="325-maximum-size-subarray-sum-equals-k.html">
            
                <a href="325-maximum-size-subarray-sum-equals-k.html">
            
                    
                    325 Maximum Size Subarray Sum Equals k
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.26" data-path="326-power-of-three.html">
            
                <a href="326-power-of-three.html">
            
                    
                    326 Power of Three
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.27" data-path="303-range-sum-query---immutable/327-count-of-range-sum.html">
            
                <a href="303-range-sum-query---immutable/327-count-of-range-sum.html">
            
                    
                    327 Count of Range Sum
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.28" data-path="328-odd-even-linked-list.html">
            
                <a href="328-odd-even-linked-list.html">
            
                    
                    328 Odd Even Linked List
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.29" data-path="303-range-sum-query---immutable/329-longest-increasing-path-in-a-matrix.html">
            
                <a href="303-range-sum-query---immutable/329-longest-increasing-path-in-a-matrix.html">
            
                    
                    329 Longest Increasing Path in a Matrix
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.30" data-path="303-range-sum-query---immutable/330-patching-array.html">
            
                <a href="303-range-sum-query---immutable/330-patching-array.html">
            
                    
                    330 Patching Array
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.31" data-path="331-verify-preorder-serialization-of-a-binary-tree.html">
            
                <a href="331-verify-preorder-serialization-of-a-binary-tree.html">
            
                    
                    331 Verify Preorder Serialization of a Binary Tree
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.32" data-path="332-reconstruct-itinerary.html">
            
                <a href="332-reconstruct-itinerary.html">
            
                    
                    332 Reconstruct Itinerary
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.33" data-path="333-largest-bst-subtree.html">
            
                <a href="333-largest-bst-subtree.html">
            
                    
                    333 Largest BST Subtree
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.34" data-path="334-increasing-triplet-subsequence.html">
            
                <a href="334-increasing-triplet-subsequence.html">
            
                    
                    334 Increasing Triplet Subsequence
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.35" data-path="303-range-sum-query---immutable/336-palindrome-pairs.html">
            
                <a href="303-range-sum-query---immutable/336-palindrome-pairs.html">
            
                    
                    336 Palindrome Pairs
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.36" data-path="337-house-robber-iii.html">
            
                <a href="337-house-robber-iii.html">
            
                    
                    337 House Robber III
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.37" data-path="338-counting-bits.html">
            
                <a href="338-counting-bits.html">
            
                    
                    338 Counting Bits
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.38" data-path="339-nested-list-weight-sum.html">
            
                <a href="339-nested-list-weight-sum.html">
            
                    
                    339 Nested List Weight Sum
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.39" data-path="303-range-sum-query---immutable/340-longest-substring-with-at-most-k-distinct-characters.html">
            
                <a href="303-range-sum-query---immutable/340-longest-substring-with-at-most-k-distinct-characters.html">
            
                    
                    340 Longest Substring with At Most K Distinct Characters
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.40" data-path="341-flatten-nested-list-iterator.html">
            
                <a href="341-flatten-nested-list-iterator.html">
            
                    
                    341 Flatten Nested List Iterator
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.41" data-path="342-power-of-four.html">
            
                <a href="342-power-of-four.html">
            
                    
                    342 Power of Four
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.42" data-path="343-integer-break.html">
            
                <a href="343-integer-break.html">
            
                    
                    343 Integer Break
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.43" data-path="344-reverse-string.html">
            
                <a href="344-reverse-string.html">
            
                    
                    344 Reverse String
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.44" data-path="345-reverse-vowels-of-a-string.html">
            
                <a href="345-reverse-vowels-of-a-string.html">
            
                    
                    345 Reverse Vowels of a String
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.45" data-path="346-moving-average-from-data-stream.html">
            
                <a href="346-moving-average-from-data-stream.html">
            
                    
                    346 Moving Average from Data Stream
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.46" data-path="347-top-k-frequent-elements.html">
            
                <a href="347-top-k-frequent-elements.html">
            
                    
                    347 Top K Frequent Elements
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.47" data-path="348-design-tic-tac-toe.html">
            
                <a href="348-design-tic-tac-toe.html">
            
                    
                    348 Design Tic-Tac-Toe
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.48" data-path="349-intersection-of-two-arrays.html">
            
                <a href="349-intersection-of-two-arrays.html">
            
                    
                    349 Intersection of Two Arrays
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.8.49" data-path="350-intersection-of-two-arrays-ii.html">
            
                <a href="350-intersection-of-two-arrays-ii.html">
            
                    
                    350 Intersection of Two Arrays II
            
                </a>
            

        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.9" data-path="solutions-351---400.html">
            
                <a href="solutions-351---400.html">
            
                    
                    Solutions 351 - 400
            
                </a>
            

            <ul class="articles">
                
    
        <li class="chapter " data-level="1.9.1" data-path="351-android-unlock-patterns.html">
            
                <a href="351-android-unlock-patterns.html">
            
                    
                    351 Android Unlock Patterns
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.2" data-path="353-design-snake-game.html">
            
                <a href="353-design-snake-game.html">
            
                    
                    353 Design Snake Game
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.3" data-path="354-russian-doll-envelopes.html">
            
                <a href="354-russian-doll-envelopes.html">
            
                    
                    354 Russian Doll Envelopes
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.4" data-path="355-design-twitter.html">
            
                <a href="355-design-twitter.html">
            
                    
                    355 Design Twitter
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.5" data-path="356-line-reflection.html">
            
                <a href="356-line-reflection.html">
            
                    
                    356 Line Reflection
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.6" data-path="357-count-numbers-with-unique-digits.html">
            
                <a href="357-count-numbers-with-unique-digits.html">
            
                    
                    357 Count Numbers with Unique Digits
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.7" data-path="359-logger-rate-limiter/358-rearrange-string-k-distance-apart.html">
            
                <a href="359-logger-rate-limiter/358-rearrange-string-k-distance-apart.html">
            
                    
                    358 Rearrange String k Distance Apart
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.8" data-path="359-logger-rate-limiter.html">
            
                <a href="359-logger-rate-limiter.html">
            
                    
                    359 Logger Rate Limiter
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.9" data-path="360-sort-transformed-array.html">
            
                <a href="360-sort-transformed-array.html">
            
                    
                    360 Sort Transformed Array
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.10" data-path="361-bomb-enemy.html">
            
                <a href="361-bomb-enemy.html">
            
                    
                    361 Bomb Enemy
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.11" data-path="362-design-hit-counter.html">
            
                <a href="362-design-hit-counter.html">
            
                    
                    362 Design Hit Counter
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.12" data-path="363-max-sum-of-rectangle-no-larger-than-k.html">
            
                <a href="363-max-sum-of-rectangle-no-larger-than-k.html">
            
                    
                    363 Max Sum of Rectangle No Larger Than K
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.13" data-path="364-nested-list-weight-sum-ii.html">
            
                <a href="364-nested-list-weight-sum-ii.html">
            
                    
                    364 Nested List Weight Sum II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.14" data-path="365-water-and-jug-problem.html">
            
                <a href="365-water-and-jug-problem.html">
            
                    
                    365 Water and Jug Problem
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.15" data-path="366-find-leaves-of-binary-tree.html">
            
                <a href="366-find-leaves-of-binary-tree.html">
            
                    
                    366 Find Leaves of Binary Tree
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.16" data-path="367-valid-perfect-square.html">
            
                <a href="367-valid-perfect-square.html">
            
                    
                    367 Valid Perfect Square
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.17" data-path="368-largest-divisible-subset.html">
            
                <a href="368-largest-divisible-subset.html">
            
                    
                    368 Largest Divisible Subset
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.18" data-path="369-plus-one-linked-list.html">
            
                <a href="369-plus-one-linked-list.html">
            
                    
                    369 Plus One Linked List
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.19" data-path="370-range-addition.html">
            
                <a href="370-range-addition.html">
            
                    
                    370 Range Addition
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.20" data-path="371-sum-of-two-integers.html">
            
                <a href="371-sum-of-two-integers.html">
            
                    
                    371 Sum of Two Integers
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.21" data-path="372-super-pow.html">
            
                <a href="372-super-pow.html">
            
                    
                    372 Super Pow
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.22" data-path="373-find-k-pairs-with-smallest-sums.html">
            
                <a href="373-find-k-pairs-with-smallest-sums.html">
            
                    
                    373 Find K Pairs with Smallest Sums
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.23" data-path="374-guess-number-higher-or-lower.html">
            
                <a href="374-guess-number-higher-or-lower.html">
            
                    
                    374 Guess Number Higher or Lower
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.24" data-path="375-guess-number-higher-or-lower-ii.html">
            
                <a href="375-guess-number-higher-or-lower-ii.html">
            
                    
                    375 Guess Number Higher or Lower II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.25" data-path="377-combination-sum-iv.html">
            
                <a href="377-combination-sum-iv.html">
            
                    
                    377 Combination Sum IV
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.26" data-path="378-kth-smallest-element-in-a-sorted-matrix.html">
            
                <a href="378-kth-smallest-element-in-a-sorted-matrix.html">
            
                    
                    378 Kth Smallest Element in a Sorted Matrix
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.27" data-path="379-design-phone-directory.html">
            
                <a href="379-design-phone-directory.html">
            
                    
                    379 Design Phone Directory
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.28" data-path="380-insert-delete-getrandom-o1.html">
            
                <a href="380-insert-delete-getrandom-o1.html">
            
                    
                    380 Insert Delete GetRandom O(1)
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.29" data-path="382-linked-list-random-node.html">
            
                <a href="382-linked-list-random-node.html">
            
                    
                    382 Linked List Random Node
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.30" data-path="388-longest-absolute-file-path.html">
            
                <a href="388-longest-absolute-file-path.html">
            
                    
                    388 Longest Absolute File Path
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.31" data-path="389-find-the-difference.html">
            
                <a href="389-find-the-difference.html">
            
                    
                    389 Find the Difference
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.32" data-path="391-perfect-rectangle.html">
            
                <a href="391-perfect-rectangle.html">
            
                    
                    391 Perfect Rectangle
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.33" data-path="393-utf-8-validation.html">
            
                <a href="393-utf-8-validation.html">
            
                    
                    393 UTF-8 Validation
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.34" data-path="394-decode-string.html">
            
                <a href="394-decode-string.html">
            
                    
                    394 Decode String
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.35" data-path="397-integer-replacement.html">
            
                <a href="397-integer-replacement.html">
            
                    
                    397 Integer Replacement
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.36" data-path="398-random-pick-index.html">
            
                <a href="398-random-pick-index.html">
            
                    
                    398 Random Pick Index
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.37" data-path="399-evaluate-division.html">
            
                <a href="399-evaluate-division.html">
            
                    
                    399 Evaluate Division
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.9.38" data-path="400-nth-digit.html">
            
                <a href="400-nth-digit.html">
            
                    
                    400 Nth Digit
            
                </a>
            

        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.10" >
            
                <span>
            
                    
                    Solutions 401 - 450
            
                </span>
            

            <ul class="articles">
                
    
        <li class="chapter " data-level="1.10.1" data-path="401-binary-watch.html">
            
                <a href="401-binary-watch.html">
            
                    
                    401 Binary Watch
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.2" data-path="402-remove-k-digits.html">
            
                <a href="402-remove-k-digits.html">
            
                    
                    402 Remove K Digits
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.3" data-path="404-sum-of-left-leaves.html">
            
                <a href="404-sum-of-left-leaves.html">
            
                    
                    404 Sum of Left Leaves
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.4" data-path="406-queue-reconstruction-by-height.html">
            
                <a href="406-queue-reconstruction-by-height.html">
            
                    
                    406 Queue Reconstruction by Height
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.5" data-path="408-valid-word-abbreviation/407-trapping-rain-water-ii.html">
            
                <a href="408-valid-word-abbreviation/407-trapping-rain-water-ii.html">
            
                    
                    407 Trapping Rain Water II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.6" data-path="408-valid-word-abbreviation.html">
            
                <a href="408-valid-word-abbreviation.html">
            
                    
                    408 Valid Word Abbreviation
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.7" data-path="409-longest-palindrome.html">
            
                <a href="409-longest-palindrome.html">
            
                    
                    409 Longest Palindrome
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.8" data-path="411-minimum-unique-word-abbreviation.html">
            
                <a href="411-minimum-unique-word-abbreviation.html">
            
                    
                    411 Minimum Unique Word Abbreviation
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.9" data-path="415-add-strings.html">
            
                <a href="415-add-strings.html">
            
                    
                    415 Add Strings
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.10" data-path="417-pacific-atlantic-water-flow.html">
            
                <a href="417-pacific-atlantic-water-flow.html">
            
                    
                    417 Pacific Atlantic Water Flow
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.11" data-path="418-sentence-screen-fitting.html">
            
                <a href="418-sentence-screen-fitting.html">
            
                    
                    418 Sentence Screen Fitting
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.12" data-path="421-maximum-xor-of-two-numbers-in-an-array.html">
            
                <a href="421-maximum-xor-of-two-numbers-in-an-array.html">
            
                    
                    421 Maximum XOR of Two Numbers in an Array
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.13" data-path="422-valid-word-square.html">
            
                <a href="422-valid-word-square.html">
            
                    
                    422 Valid Word Square
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.14" data-path="425-word-squares.html">
            
                <a href="425-word-squares.html">
            
                    
                    425 Word Squares
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.15" data-path="444-sequence-reconstruction.html">
            
                <a href="444-sequence-reconstruction.html">
            
                    
                    444 Sequence Reconstruction
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.16" data-path="447-number-of-boomerangs.html">
            
                <a href="447-number-of-boomerangs.html">
            
                    
                    447 Number of Boomerangs
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.17" data-path="448-find-all-numbers-disappeared-in-an-array.html">
            
                <a href="448-find-all-numbers-disappeared-in-an-array.html">
            
                    
                    448 Find All Numbers Disappeared in an Array
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.18" data-path="404-sum-of-left-leaves.html">
            
                <a href="404-sum-of-left-leaves.html">
            
                    
                    404 Sum of Left Leaves
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.19" data-path="410-split-array-largest-sum.html">
            
                <a href="410-split-array-largest-sum.html">
            
                    
                    410 Split Array Largest Sum
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.20" data-path="432-all-oone-data-structure.html">
            
                <a href="432-all-oone-data-structure.html">
            
                    
                    432 All O`one Data Structure
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.21" data-path="437-path-sum-iii.html">
            
                <a href="437-path-sum-iii.html">
            
                    
                    437 Path Sum III
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.10.22" data-path="450-delete-node-in-a-bst.html">
            
                <a href="450-delete-node-in-a-bst.html">
            
                    
                    450 Delete Node in a BST
            
                </a>
            

        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.11" data-path="solutions-451-500.html">
            
                <a href="solutions-451-500.html">
            
                    
                    Solutions 451 - 500
            
                </a>
            

            <ul class="articles">
                
    
        <li class="chapter " data-level="1.11.1" data-path="solutions-451-500/451-sort-characters-by-frequency.html">
            
                <a href="solutions-451-500/451-sort-characters-by-frequency.html">
            
                    
                    451 Sort Characters By Frequency
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.2" data-path="solutions-451-500/459-repeated-substring-pattern.html">
            
                <a href="solutions-451-500/459-repeated-substring-pattern.html">
            
                    
                    459 Repeated Substring Pattern
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.3" data-path="solutions-451-500/460-lfu-cache.html">
            
                <a href="solutions-451-500/460-lfu-cache.html">
            
                    
                    460 LFU Cache
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.4" data-path="solutions-451-500/461-hamming-distance.html">
            
                <a href="solutions-451-500/461-hamming-distance.html">
            
                    
                    461 Hamming Distance
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.5" data-path="solutions-451-500/463-island-perimeter.html">
            
                <a href="solutions-451-500/463-island-perimeter.html">
            
                    
                    463 Island Perimeter
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.6" data-path="solutions-451-500/465-optimal-account-balancing.html">
            
                <a href="solutions-451-500/465-optimal-account-balancing.html">
            
                    
                    465 Optimal Account Balancing
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.7" data-path="solutions-451-500/469-convex-polygon.html">
            
                <a href="solutions-451-500/469-convex-polygon.html">
            
                    
                    469 Convex Polygon
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.8" data-path="solutions-451-500/471-encode-string-with-shortest-length.html">
            
                <a href="solutions-451-500/471-encode-string-with-shortest-length.html">
            
                    
                    471 Encode String with Shortest Length 
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.9" data-path="solutions-451-500/474-ones-and-zeroes.html">
            
                <a href="solutions-451-500/474-ones-and-zeroes.html">
            
                    
                    474 Ones and Zeroes
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.10" data-path="solutions-451-500/475-heaters.html">
            
                <a href="solutions-451-500/475-heaters.html">
            
                    
                    475 Heaters
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.11" data-path="solutions-451-500/480-sliding-window-median.html">
            
                <a href="solutions-451-500/480-sliding-window-median.html">
            
                    
                    480 Sliding Window Median
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.12" data-path="solutions-451-500/481-magical-string.html">
            
                <a href="solutions-451-500/481-magical-string.html">
            
                    
                    481 Magical String
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.13" data-path="solutions-451-500/482-license-key-formatting.html">
            
                <a href="solutions-451-500/482-license-key-formatting.html">
            
                    
                    482 License Key Formatting
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.14" data-path="solutions-451-500/483-smallest-good-base.html">
            
                <a href="solutions-451-500/483-smallest-good-base.html">
            
                    
                    483 Smallest Good Base
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.15" data-path="solutions-451-500/484-find-permutation.html">
            
                <a href="solutions-451-500/484-find-permutation.html">
            
                    
                    484 Find Permutation
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.16" data-path="solutions-451-500/485-max-consecutive-ones.html">
            
                <a href="solutions-451-500/485-max-consecutive-ones.html">
            
                    
                    485 Max Consecutive Ones
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.17" data-path="solutions-451-500/486-predict-the-winner.html">
            
                <a href="solutions-451-500/486-predict-the-winner.html">
            
                    
                    486 Predict the Winner
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.18" data-path="solutions-451-500/487-max-consecutive-ones-ii.html">
            
                <a href="solutions-451-500/487-max-consecutive-ones-ii.html">
            
                    
                    487 Max Consecutive Ones II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.19" data-path="solutions-451-500/490-the-maze.html">
            
                <a href="solutions-451-500/490-the-maze.html">
            
                    
                    490 The Maze
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.20" data-path="solutions-451-500/493-reverse-pairs.html">
            
                <a href="solutions-451-500/493-reverse-pairs.html">
            
                    
                    493 Reverse Pairs
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.21" data-path="solutions-451-500/494-target-sum.html">
            
                <a href="solutions-451-500/494-target-sum.html">
            
                    
                    494 Target Sum
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.11.22" data-path="solutions-451-500/498-diagonal-traverse.html">
            
                <a href="solutions-451-500/498-diagonal-traverse.html">
            
                    
                    498 Diagonal Traverse
            
                </a>
            

        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.12" data-path="solutions-501-550.html">
            
                <a href="solutions-501-550.html">
            
                    
                    Solutions 501 - 550
            
                </a>
            

            <ul class="articles">
                
    
        <li class="chapter " data-level="1.12.1" data-path="solutions-501-550/501-find-mode-in-binary-search-tree.html">
            
                <a href="solutions-501-550/501-find-mode-in-binary-search-tree.html">
            
                    
                    501 Find Mode in Binary Search Tree
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.2" data-path="solutions-501-550/503-next-greater-element-ii.html">
            
                <a href="solutions-501-550/503-next-greater-element-ii.html">
            
                    
                    503 Next Greater Element II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.3" data-path="solutions-501-550/505-the-maze-ii.html">
            
                <a href="solutions-501-550/505-the-maze-ii.html">
            
                    
                    505 The Maze II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.4" data-path="solutions-501-550/506-relative-ranks.html">
            
                <a href="solutions-501-550/506-relative-ranks.html">
            
                    
                    506 Relative Ranks
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.5" data-path="solutions-501-550/514-freedom-trail.html">
            
                <a href="solutions-501-550/514-freedom-trail.html">
            
                    
                    514 Freedom Trail
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.6" data-path="solutions-501-550/515-find-largest-value-in-each-tree-row.html">
            
                <a href="solutions-501-550/515-find-largest-value-in-each-tree-row.html">
            
                    
                    515 Find Largest Value in Each Tree Row
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.7" data-path="solutions-501-550/520-detect-capital.html">
            
                <a href="solutions-501-550/520-detect-capital.html">
            
                    
                    520 Detect Capital
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.8" data-path="solutions-501-550/520-detect-capital/521-longest-uncommon-subsequence-i.html">
            
                <a href="solutions-501-550/520-detect-capital/521-longest-uncommon-subsequence-i.html">
            
                    
                    521 Longest Uncommon Subsequence I
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.9" data-path="solutions-501-550/526-beautiful-arrangement/522-longest-uncommon-subsequence-ii.html">
            
                <a href="solutions-501-550/526-beautiful-arrangement/522-longest-uncommon-subsequence-ii.html">
            
                    
                    522 Longest Uncommon Subsequence II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.10" data-path="solutions-501-550/523-continuous-subarray-sum.html">
            
                <a href="solutions-501-550/523-continuous-subarray-sum.html">
            
                    
                    523 Continuous Subarray Sum
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.11" data-path="solutions-501-550/524-longest-word-in-dictionary-through-deleting.html">
            
                <a href="solutions-501-550/524-longest-word-in-dictionary-through-deleting.html">
            
                    
                    524 Longest Word in Dictionary through Deleting
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.12" data-path="solutions-501-550/525-contiguous-array.html">
            
                <a href="solutions-501-550/525-contiguous-array.html">
            
                    
                    525 Contiguous Array
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.13" data-path="solutions-501-550/526-beautiful-arrangement.html">
            
                <a href="solutions-501-550/526-beautiful-arrangement.html">
            
                    
                    526 Beautiful Arrangement
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.14" data-path="solutions-501-550/527-word-abbreviation.html">
            
                <a href="solutions-501-550/527-word-abbreviation.html">
            
                    
                    527 Word Abbreviation
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.15" data-path="solutions-501-550/530-minimum-absolute-difference-in-bst.html">
            
                <a href="solutions-501-550/530-minimum-absolute-difference-in-bst.html">
            
                    
                    530 Minimum Absolute Difference in BST
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.16" data-path="solutions-501-550/531-lonely-pixel-i.html">
            
                <a href="solutions-501-550/531-lonely-pixel-i.html">
            
                    
                    531 Lonely Pixel I
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.17" data-path="solutions-501-550/533-lonely-pixel-ii.html">
            
                <a href="solutions-501-550/533-lonely-pixel-ii.html">
            
                    
                    533 Lonely Pixel II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.18" data-path="solutions-501-550/534-design-tinyurl.html">
            
                <a href="solutions-501-550/534-design-tinyurl.html">
            
                    
                    534 Design TinyURL
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.19" data-path="solutions-501-550/535-encode-and-decode-tinyurl.html">
            
                <a href="solutions-501-550/535-encode-and-decode-tinyurl.html">
            
                    
                    535 Encode and Decode TinyURL
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.20" data-path="solutions-501-550/541-reverse-string-ii.html">
            
                <a href="solutions-501-550/541-reverse-string-ii.html">
            
                    
                    541 Reverse String II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.21" data-path="solutions-501-550/542-01-matrix.html">
            
                <a href="solutions-501-550/542-01-matrix.html">
            
                    
                    542 01 Matrix
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.22" data-path="solutions-501-550/543-diameter-of-binary-tree.html">
            
                <a href="solutions-501-550/543-diameter-of-binary-tree.html">
            
                    
                    543 Diameter of Binary Tree
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.23" data-path="solutions-501-550/544-output-contest-matches.html">
            
                <a href="solutions-501-550/544-output-contest-matches.html">
            
                    
                    544 Output Contest Matches
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.24" data-path="solutions-501-550/545-boundary-of-binary-tree.html">
            
                <a href="solutions-501-550/545-boundary-of-binary-tree.html">
            
                    
                    545 Boundary of Binary Tree
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.25" data-path="solutions-501-550/549-binary-tree-longest-consecutive-sequence-ii.html">
            
                <a href="solutions-501-550/549-binary-tree-longest-consecutive-sequence-ii.html">
            
                    
                    549 Binary Tree Longest Consecutive Sequence II
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.12.26" data-path="solutions-501-550/516-longest-palindromic-subsequence.html">
            
                <a href="solutions-501-550/516-longest-palindromic-subsequence.html">
            
                    
                    516 Longest Palindromic Subsequence
            
                </a>
            

        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.13" data-path="solutions-551-600.html">
            
                <a href="solutions-551-600.html">
            
                    
                    Solutions 551 - 600
            
                </a>
            

            <ul class="articles">
                
    
        <li class="chapter " data-level="1.13.1" data-path="solutions-551-600/551-student-attendance-record-i.html">
            
                <a href="solutions-551-600/551-student-attendance-record-i.html">
            
                    
                    551 Student Attendance Record I
            
                </a>
            

        </li>
    
        <li class="chapter " data-level="1.13.2" data-path="solutions-551-600/552-student-attendance-record-ii.html">
            
                <a href="solutions-551-600/552-student-attendance-record-ii.html">
            
                    
                    552 Student Attendance Record II
            
                </a>
            

        </li>
    
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                    560 Subarray Sum Equals K
            
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                    562 Longest Line of Consecutive One in Matrix
            
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                    568 Maximum Vacation Days
            
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                    569 Median Employee Salary
            
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                    554 Brick Wall
            
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                    Solutions 601 - 650
            
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                    621 Task Scheduler
            
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                    633 Sum of Square Numbers
            
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                    636 Exclusive Time of Functions
            
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                    637 Average of Levels in Binary Tree
            
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                    639 Decode Ways II
            
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                    642 Design Search Autocomplete System
            
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                    647 Palindromic Substrings
            
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                    648 Replace Words
            
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                    Solutions 651 - 700
            
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                    653 Two Sum IV - Input is a BST
            
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                    689 Maximum Sum of 3 Non-Overlapping Subarrays
            
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                    670 Maximum Swap
            
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                    671 Second Minimum Node In a Binary Tree
            
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                    680 Valid Palindrome II
            
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                    690 Employee Importance
            
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                    692 Top K Frequent Words
            
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                    698 Partition to K Equal Sum Subsets
            
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                    699 Falling Squares
            
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                    Solutions 701 - 750
            
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                    714 Best Time to Buy and Sell Stock with Transaction Fee
            
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                    716 Max Stack
            
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                    744 Find Smallest Letter Greater Than Target
            
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                    730 Count Different Palindromic Subsequences
            
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                                <h1 id="137-single-number-ii-&#x2013;-medium">137 Single Number II &#x2013; Medium</h1>
<h3 id="problem">Problem:</h3>
<p>Given an array of integers, every element appears three times except for one. Find that single one.</p>
<p>Note:
Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory?</p>
<h3 id="thoughts">Thoughts:</h3>
<p>This is surely a tricky question. It&#x2019;s good to know how to solve. But I don&#x2019;t think this is a good interview question, namely not a good question to measure a programmer&#x2019;s problem solving skills.</p>
<p>We keep variable for number that appears once, twice and three times. Each iteration updates these three variables and the variable for appearing once will be the returning result.</p>
<p>The key idea is that we need to get rid of the number that appears three times from the variable for once and twice.</p>
<h3 id="solutions">Solutions:</h3>
<pre><code class="lang-java"><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Solution</span> </span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">int</span> <span class="hljs-title">singleNumber</span><span class="hljs-params">(<span class="hljs-keyword">int</span>[] nums)</span> </span>{
        <span class="hljs-keyword">int</span> one = <span class="hljs-number">0</span>;
        <span class="hljs-keyword">int</span> two = <span class="hljs-number">0</span>;
        <span class="hljs-keyword">int</span> three = <span class="hljs-number">0</span>;
        <span class="hljs-keyword">for</span> (<span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>; i &lt; nums.length; i ++){
            two = two | ( one &amp; nums[i]);
            one = one ^ nums[i];
            three = one &amp; two;
            one = one &amp; (~three);
            two = two &amp; (~three);
        }<span class="hljs-comment">//for</span>
        <span class="hljs-keyword">return</span> one;
    }
}
</code></pre>

                                
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