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<!DOCTYPE HTML>
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<title>122 Best Time to Buy and Sell Stock II – Medium · GitBook</title>
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<input type="text" placeholder="Type to search" />
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<nav role="navigation">
<ul class="summary">
<li class="chapter " data-level="1.1" data-path="./">
<a href="./">
Introduction
</a>
</li>
<li class="chapter " data-level="1.2" data-path="solutions_1_-_50.html">
<a href="solutions_1_-_50.html">
Solutions 1 - 50
</a>
<ul class="articles">
<li class="chapter " data-level="1.2.1" data-path="1_leetcode_java_two_sum__medium.html">
<a href="1_leetcode_java_two_sum__medium.html">
1Two Sum – Medium
</a>
</li>
<li class="chapter " data-level="1.2.2" data-path="2_leetcode_java_add_two_numbers__medium.html">
<a href="2_leetcode_java_add_two_numbers__medium.html">
2 Add Two Numbers – Medium
</a>
</li>
<li class="chapter " data-level="1.2.3" data-path="3_leetcode_java_longest_substring_without_repeatin.html">
<a href="3_leetcode_java_longest_substring_without_repeatin.html">
3 Longest Substring Without Repeating Characters
</a>
</li>
<li class="chapter " data-level="1.2.4" data-path="4-median-of-two-sorted-arrays.html">
<a href="4-median-of-two-sorted-arrays.html">
4 Median of Two Sorted Arrays
</a>
</li>
<li class="chapter " data-level="1.2.5" data-path="5_longest_palindromic_substring.html">
<a href="5_longest_palindromic_substring.html">
5 Longest Palindromic Substring
</a>
</li>
<li class="chapter " data-level="1.2.6" data-path="6_zigzag_conversion__easy.html">
<a href="6_zigzag_conversion__easy.html">
6 ZigZag Conversion – Easy
</a>
</li>
<li class="chapter " data-level="1.2.7" data-path="7_reverse_integer__easy.html">
<a href="7_reverse_integer__easy.html">
7 Reverse Integer – Easy
</a>
</li>
<li class="chapter " data-level="1.2.8" data-path="8_string_to_integer_atoi__easy.html">
<a href="8_string_to_integer_atoi__easy.html">
8 String to Integer (atoi) – Easy
</a>
</li>
<li class="chapter " data-level="1.2.9" data-path="9_palindrome_number__easy.html">
<a href="9_palindrome_number__easy.html">
9 Palindrome Number – Easy
</a>
</li>
<li class="chapter " data-level="1.2.10" data-path="10-regular-expression-matching.html">
<a href="10-regular-expression-matching.html">
10 Regular Expression Matching
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<li class="chapter " data-level="1.2.11" data-path="11_leetcode_java_container_with_most_water__medium.html">
<a href="11_leetcode_java_container_with_most_water__medium.html">
11 Container With Most Water – Medium
</a>
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<li class="chapter " data-level="1.2.12" data-path="12_integer_to_roman__medium.html">
<a href="12_integer_to_roman__medium.html">
12 Integer to Roman – Medium
</a>
</li>
<li class="chapter " data-level="1.2.13" data-path="13_roman_to_integer__easy.html">
<a href="13_roman_to_integer__easy.html">
13 Roman to Integer – Easy
</a>
</li>
<li class="chapter " data-level="1.2.14" data-path="14_longest_common_prefix__easy.html">
<a href="14_longest_common_prefix__easy.html">
14 Longest Common Prefix – Easy
</a>
</li>
<li class="chapter " data-level="1.2.15" data-path="15_3sum__medium.html">
<a href="15_3sum__medium.html">
15 3Sum – Medium
</a>
</li>
<li class="chapter " data-level="1.2.16" data-path="16_3sum_closest__medium.html">
<a href="16_3sum_closest__medium.html">
16 3Sum Closest – Medium
</a>
</li>
<li class="chapter " data-level="1.2.17" data-path="17_letter_combinations_of_a_phone_number__medium.html">
<a href="17_letter_combinations_of_a_phone_number__medium.html">
17 Letter Combinations of a Phone Number – Medium
</a>
</li>
<li class="chapter " data-level="1.2.18" data-path="18_4sum__medium.html">
<a href="18_4sum__medium.html">
18 4Sum – Medium
</a>
</li>
<li class="chapter " data-level="1.2.19" data-path="19_remove_nth_node_from_end_of_list__easy.html">
<a href="19_remove_nth_node_from_end_of_list__easy.html">
19 Remove Nth Node From End of List – Easy
</a>
</li>
<li class="chapter " data-level="1.2.20" data-path="20_valid_parentheses__easy.html">
<a href="20_valid_parentheses__easy.html">
20 Valid Parentheses – Easy
</a>
</li>
<li class="chapter " data-level="1.2.21" data-path="21_merge_two_sorted_lists__easy.html">
<a href="21_merge_two_sorted_lists__easy.html">
21 Merge Two Sorted Lists – Easy
</a>
</li>
<li class="chapter " data-level="1.2.22" data-path="22_generate_parentheses__medium.html">
<a href="22_generate_parentheses__medium.html">
22 Generate Parentheses – Medium
</a>
</li>
<li class="chapter " data-level="1.2.23" data-path="23-merge-k-sorted-lists.html">
<a href="23-merge-k-sorted-lists.html">
23 Merge k Sorted Lists
</a>
</li>
<li class="chapter " data-level="1.2.24" data-path="24_swap_nodes_in_pairs__medium.html">
<a href="24_swap_nodes_in_pairs__medium.html">
24 Swap Nodes in Pairs – Medium
</a>
</li>
<li class="chapter " data-level="1.2.25" data-path="25-reverse-nodes-in-k-group.html">
<a href="25-reverse-nodes-in-k-group.html">
25 Reverse Nodes in k-Group
</a>
</li>
<li class="chapter " data-level="1.2.26" data-path="26_remove_duplicates_from_sorted_array__easy.html">
<a href="26_remove_duplicates_from_sorted_array__easy.html">
26 Remove Duplicates from Sorted Array – Easy
</a>
</li>
<li class="chapter " data-level="1.2.27" data-path="27_remove_element__easy.html">
<a href="27_remove_element__easy.html">
27 Remove Element – Easy
</a>
</li>
<li class="chapter " data-level="1.2.28" data-path="28_implement_strstr__easy.html">
<a href="28_implement_strstr__easy.html">
28 Implement strStr() – Easy
</a>
</li>
<li class="chapter " data-level="1.2.29" data-path="29_divide_two_integers__medium.html">
<a href="29_divide_two_integers__medium.html">
29 Divide Two Integers – Medium
</a>
</li>
<li class="chapter " data-level="1.2.30" data-path="31_next_permutation__medium.html">
<a href="31_next_permutation__medium.html">
31 Next Permutation – Medium
</a>
</li>
<li class="chapter " data-level="1.2.31" data-path="33_leetcode_java_search_in_rotated_sorted_array__h.html">
<a href="33_leetcode_java_search_in_rotated_sorted_array__h.html">
33 Search in Rotated Sorted Array – Hard
</a>
</li>
<li class="chapter " data-level="1.2.32" data-path="34_search_for_a_range__medium.html">
<a href="34_search_for_a_range__medium.html">
34 Search for a Range – Medium
</a>
</li>
<li class="chapter " data-level="1.2.33" data-path="35_search_insert_position__medium.html">
<a href="35_search_insert_position__medium.html">
35 Search Insert Position – Medium
</a>
</li>
<li class="chapter " data-level="1.2.34" data-path="36_valid_sudoku__easy.html">
<a href="36_valid_sudoku__easy.html">
36 Valid Sudoku – Easy
</a>
</li>
<li class="chapter " data-level="1.2.35" data-path="37-sudoku-solver.html">
<a href="37-sudoku-solver.html">
37 Sudoku Solver
</a>
</li>
<li class="chapter " data-level="1.2.36" data-path="38_count_and_say__easy.html">
<a href="38_count_and_say__easy.html">
38 Count and Say – Easy
</a>
</li>
<li class="chapter " data-level="1.2.37" data-path="39_combination_sum__medium.html">
<a href="39_combination_sum__medium.html">
39 Combination Sum – Medium
</a>
</li>
<li class="chapter " data-level="1.2.38" data-path="40_combination_sum_ii__medium.html">
<a href="40_combination_sum_ii__medium.html">
40 Combination Sum II – Medium
</a>
</li>
<li class="chapter " data-level="1.2.39" data-path="42-trapping-rain-water.html">
<a href="42-trapping-rain-water.html">
42 Trapping Rain Water
</a>
</li>
<li class="chapter " data-level="1.2.40" data-path="43_multiply_strings__medium.html">
<a href="43_multiply_strings__medium.html">
43 Multiply Strings – Medium
</a>
</li>
<li class="chapter " data-level="1.2.41" data-path="44-wildcard-matching.html">
<a href="44-wildcard-matching.html">
44 Wildcard Matching
</a>
</li>
<li class="chapter " data-level="1.2.42" data-path="46_permutations__medium.html">
<a href="46_permutations__medium.html">
46 Permutations – Medium
</a>
</li>
<li class="chapter " data-level="1.2.43" data-path="47_permutations_ii_medium.html">
<a href="47_permutations_ii_medium.html">
47 Permutations II – Medium
</a>
</li>
<li class="chapter " data-level="1.2.44" data-path="48_rotate_image__medium.html">
<a href="48_rotate_image__medium.html">
48 Rotate Image – Medium
</a>
</li>
<li class="chapter " data-level="1.2.45" data-path="49_group_anagrams__medium.html">
<a href="49_group_anagrams__medium.html">
49 Group Anagrams – Medium
</a>
</li>
<li class="chapter " data-level="1.2.46" data-path="50_powx,_n__medium.html">
<a href="50_powx,_n__medium.html">
50 Pow(x, n) – Medium
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="1.3" data-path="solutions_51_-_100.html">
<a href="solutions_51_-_100.html">
Solutions 51 - 100
</a>
<ul class="articles">
<li class="chapter " data-level="1.3.1" data-path="53_maximum_subarray__medium.html">
<a href="53_maximum_subarray__medium.html">
53 Maximum Subarray – Medium
</a>
</li>
<li class="chapter " data-level="1.3.2" data-path="54_spiral_matrix__medium.html">
<a href="54_spiral_matrix__medium.html">
54 Spiral Matrix – Medium
</a>
</li>
<li class="chapter " data-level="1.3.3" data-path="55_jump_game__medium.html">
<a href="55_jump_game__medium.html">
55 Jump Game – Medium
</a>
</li>
<li class="chapter " data-level="1.3.4" data-path="56-merge-intervals.html">
<a href="56-merge-intervals.html">
56 Merge Intervals
</a>
</li>
<li class="chapter " data-level="1.3.5" data-path="56-merge-intervals/57-insert-interval.html">
<a href="56-merge-intervals/57-insert-interval.html">
57 Insert Interval
</a>
</li>
<li class="chapter " data-level="1.3.6" data-path="58_length_of_last_word__easy.html">
<a href="58_length_of_last_word__easy.html">
58 Length of Last Word – Easy
</a>
</li>
<li class="chapter " data-level="1.3.7" data-path="59_spiral_matrix_ii__medium.html">
<a href="59_spiral_matrix_ii__medium.html">
59 Spiral Matrix II – Medium
</a>
</li>
<li class="chapter " data-level="1.3.8" data-path="60_permutation_sequence__medium.html">
<a href="60_permutation_sequence__medium.html">
60 Permutation Sequence – Medium
</a>
</li>
<li class="chapter " data-level="1.3.9" data-path="61_rotate_list__medium.html">
<a href="61_rotate_list__medium.html">
61 Rotate List – Medium
</a>
</li>
<li class="chapter " data-level="1.3.10" data-path="62_unique_paths__medium.html">
<a href="62_unique_paths__medium.html">
62 Unique Paths – Medium
</a>
</li>
<li class="chapter " data-level="1.3.11" data-path="62_unique_paths_ii__medium.html">
<a href="62_unique_paths_ii__medium.html">
63 Unique Paths II – Medium
</a>
</li>
<li class="chapter " data-level="1.3.12" data-path="64_minimum_path_sum__medium.html">
<a href="64_minimum_path_sum__medium.html">
64 Minimum Path Sum – Medium
</a>
</li>
<li class="chapter " data-level="1.3.13" data-path="65-valid-number.html">
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