index | Problem | Acceptance | Difficulty
| -| -|
1 | Two Sum | 28.5% | Easy
2 | Add Two Numbers | 25.7% | Medium
3 | Longest Substring Without Repeating Characters | 23.5% | Medium
4 | Median of Two Sorted Arrays | 20.4% | Hard
5 | Longest Palindromic Substring | 24.0% | Medium
6 | ZigZag Conversion | 25.6% | Easy
7 | Reverse Integer | 23.7% | Easy
8 | String to Integer (atoi) | 13.8% | Easy
9 | Palindrome Number | 33.7% | Easy
10 | Regular Expression Matching | 23.3% | Hard
11 | Container With Most Water | 35.9% | Medium
12 | Integer to Roman | 42.2% | Medium
13 | Roman to Integer | 42.8% | Easy
14 | Longest Common Prefix | 30.2% | Easy
15 | 3Sum | 20.5% | Medium
16 | 3Sum Closest | 30.3% | Medium
17 | Letter Combinations of a Phone Number | 31.7% | Medium
18 | 4Sum | 25.3% | Medium
19 | Remove Nth Node From End of List | 31.7% | Easy
20 | Valid Parentheses | 31.5% | Easy
21 | Merge Two Sorted Lists | 37.5% | Easy
22 | Generate Parentheses | 40.9% | Medium
23 | Merge k Sorted Lists | 25.4% | Hard
24 | Swap Nodes in Pairs | 36.8% | Easy
25 | Reverse Nodes in k-Group | 29.3% | Hard
26 | Remove Duplicates from Sorted Array | 35.0% | Easy
27 | Remove Element | 36.4% | Easy
28 | Implement strStr() | 26.6% | Easy
29 | Divide Two Integers | 15.9% | Medium
30 | Substring with Concatenation of All Words | 21.6% | Hard
31 | Next Permutation | 27.9% | Medium
32 | Longest Valid Parentheses | 23.0% | Hard
33 | Search in Rotated Sorted Array | 31.6% | Hard
34 | Search for a Range | 30.6% | Medium
35 | Search Insert Position | 38.7% | Medium
36 | Valid Sudoku | 33.3% | Easy
37 | Sudoku Solver | 27.5% | Hard
38 | Count and Say | 31.9% | Easy
39 | Combination Sum | 34.9% | Medium
40 | Combination Sum II | 30.6% | Medium
41 | First Missing Positive | 24.8% | Hard
42 | Trapping Rain Water | 34.7% | Hard
43 | Multiply Strings | 25.5% | Medium
44 | Wildcard Matching | 18.7% | Hard
45 | Jump Game II | 25.9% | Hard
46 | Permutations | 39.5% | Medium
47 | Permutations II | 30.4% | Medium
48 | Rotate Image | 36.6% | Medium
49 | Group Anagrams | 31.0% | Medium
50 | Pow(x, n) | 27.2% | Medium
51 | N-Queens | 28.5% | Hard
52 | N-Queens II | 42.2% | Hard
53 | Maximum Subarray | 38.3% | Medium
54 | Spiral Matrix | 24.2% | Medium
55 | Jump Game | 29.1% | Medium
56 | Merge Intervals | 27.8% | Hard
57 | Insert Interval | 25.8% | Hard
58 | Length of Last Word | 30.8% | Easy
59 | Spiral Matrix II | 37.5% | Medium
62 | Unique Paths | 38.7% | Medium
63 | Unique Paths II | 30.6% | Medium
64 | Minimum Path Sum | 36.8% | Medium
65 | Valid Number | 12.5% | Hard
66 | Plus One | 36.3% | Easy
67 | Add Binary | 29.9% | Easy
68 | Text Justification | 17.7% | Hard
69 | Sqrt(x) | 26.6% | Medium
70 | Climbing Stairs | 38.3% | Easy
71 | Simplify Path | 23.6% | Medium
72 | Edit Distance | 30.3% | Hard
73 | Set Matrix Zeroes | 34.9% | Medium
74 | Search a 2D Matrix | 35.4% | Medium
75 | Sort Colors | 36.3% | Medium
76 | Minimum Window Substring | 23.2% | Hard
77 | Combinations | 37.2% | Medium
78 | Subsets | 35.6% | Medium
79 | Word Search | 24.9% | Medium
80 | Remove Duplicates from Sorted Array II | 34.5% | Medium
81 | Search in Rotated Sorted Array II | 32.8% | Medium
82 | Remove Duplicates from Sorted List II | 28.4% | Medium
83 | Remove Duplicates from Sorted List | 38.5% | Easy
84 | Largest Rectangle in Histogram | 25.4% | Hard
85 | Maximal Rectangle | 25.5% | Hard
86 | Partition List | 31.2% | Medium
87 | Scramble String | 28.0% | Hard
88 | Merge Sorted Array | 31.1% | Easy
89 | Gray Code | 38.8% | Medium
90 | Subsets II | 33.2% | Medium
91 | Decode Ways | 18.6% | Medium
92 | Reverse Linked List II | 29.5% | Medium
93 | Restore IP Addresses | 25.4% | Medium
94 | Binary Tree Inorder Traversal | 43.0% | Medium
95 | Unique Binary Search Trees II | 30.3% | Medium
96 | Unique Binary Search Trees | 39.4% | Medium
97 | Interleaving String | 23.7% | Hard
98 | Validate Binary Search Tree | 22.1% | Medium
99 | Recover Binary Search Tree | 28.3% | Hard
100 | Same Tree | 44.9% | Easy
101 | Symmetric Tree | 36.4% | Easy
102 | Binary Tree Level Order Traversal | 36.2% | Easy
103 | Binary Tree Zigzag Level Order Traversal | 31.5% | Medium
104 | Maximum Depth of Binary Tree | 50.3% | Easy
105 | Construct Binary Tree from Preorder and Inorder Traversal | 30.4% | Medium
106 | Construct Binary Tree from Inorder and Postorder Traversal | 30.6% | Medium
107 | Binary Tree Level Order Traversal II | 37.1% | Easy
108 | Convert Sorted Array to Binary Search Tree | 39.9% | Medium
109 | Convert Sorted List to Binary Search Tree | 32.3% | Medium
110 | Balanced Binary Tree | 35.9% | Easy
111 | Minimum Depth of Binary Tree | 32.0% | Easy
112 | Path Sum | 32.6% | Easy
113 | Path Sum II | 30.8% | Medium
114 | Flatten Binary Tree to Linked List | 33.1% | Medium
115 | Distinct Subsequences | 30.3% | Hard
116 | Populating Next Right Pointers in Each Node | 36.8% | Medium
117 | Populating Next Right Pointers in Each Node II | 33.3% | Hard
118 | Pascal's Triangle | 36.1% | Easy
119 | Pascal's Triangle II | 34.5% | Easy
120 | Triangle | 32.1% | Medium
121 | Best Time to Buy and Sell Stock | 38.5% | Easy
122 | Best Time to Buy and Sell Stock II | 45.0% | Medium
123 | Best Time to Buy and Sell Stock III | 27.9% | Hard
124 | Binary Tree Maximum Path Sum | 24.7% | Hard
125 | Valid Palindrome | 25.0% | Easy
126 | Word Ladder II | 13.7% | Hard
127 | Word Ladder | 19.3% | Medium
128 | Longest Consecutive Sequence | 34.8% | Hard
129 | Sum Root to Leaf Numbers | 34.7% | Medium
130 | Surrounded Regions | 17.2% | Medium
131 | Palindrome Partitioning | 30.2% | Medium
132 | Palindrome Partitioning II | 23.2% | Hard
133 | Clone Graph | 24.9% | Medium
134 | Gas Station | 28.4% | Medium
135 | Candy | 23.7% | Hard
136 | Single Number | 52.2% | Easy
137 | Single Number II | 39.7% | Medium
138 | Copy List with Random Pointer | 26.3% | Hard
139 | Word Break | 27.6% | Medium
140 | Word Break II | 21.7% | Hard
141 | Linked List Cycle | 36.0% | Easy
142 | Linked List Cycle II | 31.2% | Medium
143 | Reorder List | 24.3% | Medium
144 | Binary Tree Preorder Traversal | 42.5% | Medium
145 | Binary Tree Postorder Traversal | 37.9% | Hard
146 | LRU Cache | 15.9% | Hard
147 | Insertion Sort List | 31.4% | Medium
148 | Sort List | 26.9% | Medium
149 | Max Points on a Line | 15.3% | Hard
150 | Evaluate Reverse Polish Notation | 25.5% | Medium
151 | Reverse Words in a String | 15.7% | Medium
152 | Maximum Product Subarray | 24.0% | Medium
153 | Find Minimum in Rotated Sorted Array | 38.2% | Medium
154 | Find Minimum in Rotated Sorted Array II | 35.9% | Hard
155 | Min Stack | 25.5% | Easy
156 | Binary Tree Upside Down | 41.6% | Medium
157 | Read N Characters Given Read4 | 29.4% | Easy
158 | Read N Characters Given Read4 II - Call multiple times | 24.3% | Hard
159 | Longest Substring with At Most Two Distinct Characters | 38.7% | Hard
160 | Intersection of Two Linked Lists | 30.2% | Easy
161 | One Edit Distance | 30.0% | Medium
162 | Find Peak Element | 35.3% | Medium
163 | Missing Ranges | 29.2% | Medium
164 | Maximum Gap | 28.3% | Hard
165 | Compare Version Numbers | 18.9% | Easy
166 | Fraction to Recurring Decimal | 16.5% | Medium
167 | Two Sum II - Input array is sorted | 48.1% | Medium
168 | Excel Sheet Column Title | 24.0% | Easy
169 | Majority Element | 44.2% | Easy
170 | Two Sum III - Data structure design | 22.6% | Easy
171 | Excel Sheet Column Number | 44.7% | Easy
172 | Factorial Trailing Zeroes | 34.5% | Easy
173 | Binary Search Tree Iterator | 38.2% | Medium
174 | Dungeon Game | 22.6% | Hard
179 | Largest Number | 21.0% | Medium
186 | Reverse Words in a String II | 28.6% | Medium
187 | Repeated DNA Sequences | 28.9% | Medium
188 | Best Time to Buy and Sell Stock IV | 23.6% | Hard
189 | Rotate Array | 23.1% | Easy
190 | Reverse Bits | 29.5% | Easy
191 | Number of 1 Bits | 38.2% | Easy
198 | House Robber | 36.9% | Easy
199 | Binary Tree Right Side View | 38.1% | Medium
200 | Number of Islands | 31.4% | Medium
201 | Bitwise AND of Numbers Range | 32.8% | Medium
202 | Happy Number | 38.8% | Easy
203 | Remove Linked List Elements | 30.6% | Easy
204 | Count Primes | 25.9% | Easy
205 | Isomorphic Strings | 32.0% | Easy
206 | Reverse Linked List | 42.8% | Easy
207 | Course Schedule | 29.8% | Medium
208 | Implement Trie (Prefix Tree) | 25.6% | Medium
209 | Minimum Size Subarray Sum | 28.2% | Medium
210 | Course Schedule II | 24.6% | Medium
211 | Add and Search Word - Data structure design | 20.0% | Medium
212 | Word Search II | 21.8% | Hard
213 | House Robber II | 32.7% | Medium
214 | Shortest Palindrome | 22.4% | Hard
215 | Kth Largest Element in an Array | 36.7% | Medium
216 | Combination Sum III | 40.9% | Medium
217 | Contains Duplicate | 43.1% | Easy
218 | The Skyline Problem | 24.9% | Hard
219 | Contains Duplicate II | 31.1% | Easy
220 | Contains Duplicate III | 19.5% | Medium
221 | Maximal Square | 26.4% | Medium
222 | Count Complete Tree Nodes | 26.7% | Medium
223 | Rectangle Area | 31.6% | Easy
224 | Basic Calculator | 24.9% | Hard
225 | Implement Stack using Queues | 31.0% | Easy
226 | Invert Binary Tree | 49.1% | Easy
227 | Basic Calculator II | 27.6% | Medium
228 | Summary Ranges | 27.3% | Medium
229 | Majority Element II | 27.4% | Medium
230 | Kth Smallest Element in a BST | 41.3% | Medium
231 | Power of Two | 38.9% | Easy
232 | Implement Queue using Stacks | 34.8% | Easy
233 | Number of Digit One | 26.9% | Hard
234 | Palindrome Linked List | 31.0% | Easy
235 | Lowest Common Ancestor of a Binary Search Tree | 37.9% | Easy
236 | Lowest Common Ancestor of a Binary Tree | 29.2% | Medium
237 | Delete Node in a Linked List | 45.0% | Easy
238 | Product of Array Except Self | 46.2% | Medium
239 | Sliding Window Maximum | 30.7% | Hard
240 | Search a 2D Matrix II | 37.4% | Medium
241 | Different Ways to Add Parentheses | 40.3% | Medium
242 | Valid Anagram | 44.3% | Easy
243 | Shortest Word Distance | 49.9% | Easy
244 | Shortest Word Distance II | 34.9% | Medium
245 | Shortest Word Distance III | 48.9% | Medium
246 | Strobogrammatic Number | 38.2% | Easy
247 | Strobogrammatic Number II | 37.3% | Medium
248 | Strobogrammatic Number III | 29.9% | Hard
249 | Group Shifted Strings | 37.1% | Easy
250 | Count Univalue Subtrees | 39.8% | Medium
251 | Flatten 2D Vector | 37.7% | Medium
252 | Meeting Rooms | 44.6% | Easy
253 | Meeting Rooms II | 37.7% | Medium
254 | Factor Combinations | 39.4% | Medium
255 | Verify Preorder Sequence in Binary Search Tree | 38.3% | Medium
256 | Paint House | 45.4% | Medium
257 | Binary Tree Paths | 33.7% | Easy
258 | Add Digits | 49.9% | Easy
259 | 3Sum Smaller | 40.1% | Medium
260 | Single Number III | 48.4% | Medium
261 | Graph Valid Tree | 35.7% | Medium
263 | Ugly Number | 38.1% | Easy
264 | Ugly Number II | 31.1% | Medium
265 | Paint House II | 36.8% | Hard
266 | Palindrome Permutation | 54.2% | Easy
267 | Palindrome Permutation II | 30.3% | Medium
268 | Missing Number | 43.0% | Medium
269 | Alien Dictionary | 23.0% | Hard
270 | Closest Binary Search Tree Value | 37.2% | Easy
271 | Encode and Decode Strings | 26.4% | Medium
272 | Closest Binary Search Tree Value II | 36.8% | Hard
273 | Integer to English Words | 20.7% | Hard
274 | H-Index | 31.6% | Medium
275 | H-Index II | 33.4% | Medium
276 | Paint Fence | 33.3% | Easy
277 | Find the Celebrity | 35.5% | Medium
278 | First Bad Version | 24.0% | Easy
279 | Perfect Squares | 34.5% | Medium
280 | Wiggle Sort | 53.9% | Medium
281 | Zigzag Iterator | 47.1% | Medium
282 | Expression Add Operators | 27.8% | Hard
283 | Move Zeroes | 47.1% | Easy
284 | Peeking Iterator | 34.8% | Medium
285 | Inorder Successor in BST | 36.2% | Medium
286 | Walls and Gates | 41.3% | Medium
287 | Find the Duplicate Number | 41.3% | Hard
288 | Unique Word Abbreviation | 15.3% | Easy
289 | Game of Life | 36.1% | Medium
290 | Word Pattern | 31.6% | Easy
291 | Word Pattern II | 37.1% | Hard
292 | Nim Game | 54.5% | Easy
293 | Flip Game | 53.1% | Easy
294 | Flip Game II | 44.3% | Medium
295 | Find Median from Data Stream | 23.1% | Hard
296 | Best Meeting Point | 49.6% | Hard
297 | Serialize and Deserialize Binary Tree | 30.7% | Hard
298 | Binary Tree Longest Consecutive Sequence | 39.2% | Medium
299 | Bulls and Cows | 32.7% | Easy
300 | Longest Increasing Subsequence | 36.9% | Medium
301 | Remove Invalid Parentheses | 34.2% | Hard
302 | Smallest Rectangle Enclosing Black Pixels | 42.7% | Hard
303 | Range Sum Query - Immutable | 26.0% | Easy
304 | Range Sum Query 2D - Immutable | 22.6% | Medium
305 | Number of Islands II | 37.4% | Hard
306 | Additive Number | 27.0% | Medium
307 | Range Sum Query - Mutable | 18.5% | Medium
308 | Range Sum Query 2D - Mutable | 20.0% | Hard
309 | Best Time to Buy and Sell Stock with Cooldown | 39.2% | Medium
310 | Minimum Height Trees | 28.2% | Medium
311 | Sparse Matrix Multiplication | 49.8% | Medium
312 | Burst Balloons | 41.1% | Hard
313 | Super Ugly Number | 36.6% | Medium
314 | Binary Tree Vertical Order Traversal | 34.2% | Medium
315 | Count of Smaller Numbers After Self | 33.0% | Hard
316 | Remove Duplicate Letters | 28.0% | Hard
317 | Shortest Distance from All Buildings | 32.7% | Hard
318 | Maximum Product of Word Lengths | 41.6% | Medium
319 | Bulb Switcher | 41.7% | Medium
320 | Generalized Abbreviation | 42.5% | Medium
321 | Create Maximum Number | 23.5% | Hard
322 | Coin Change | 25.9% | Medium
323 | Number of Connected Components in an Undirected Graph | 45.7% | Medium
324 | Wiggle Sort II | 24.7% | Medium
325 | Maximum Size Subarray Sum Equals k | 41.4% | Medium
326 | Power of Three | 38.9% | Easy
327 | Count of Range Sum | 28.2% | Hard
328 | Odd Even Linked List | 41.3% | Medium
329 | Longest Increasing Path in a Matrix | 34.7% | Hard
330 | Patching Array | 31.1% | Hard
331 | Verify Preorder Serialization of a Binary Tree | 34.5% | Medium
332 | Reconstruct Itinerary | 27.4% | Medium
333 | Largest BST Subtree | 29.2% | Medium
334 | Increasing Triplet Subsequence | 37.2% | Medium
335 | Self Crossing | 23.3% | Hard
336 | Palindrome Pairs | 23.8% | Hard
337 | House Robber III | 40.8% | Medium
338 | Counting Bits | 59.0% | Medium
339 | Nested List Weight Sum | 59.3% | Easy
340 | Longest Substring with At Most K Distinct Characters | 38.6% | Hard
341 | Flatten Nested List Iterator | 37.2% | Medium
342 | Power of Four | 36.9% | Easy
343 | Integer Break | 44.4% | Medium
344 | Reverse String | 57.4% | Easy
345 | Reverse Vowels of a String | 36.8% | Easy
346 | Moving Average from Data Stream | 56.5% | Easy
347 | Top K Frequent Elements | 45.2% | Medium
348 | Design Tic-Tac-Toe | 44.8% | Medium
349 | Intersection of Two Arrays | 45.1% | Easy
350 | Intersection of Two Arrays II | 43.0% | Easy
351 | Android Unlock Patterns | 41.3% | Medium
352 | Data Stream as Disjoint Intervals | 38.4% | Hard
353 | Design Snake Game | 24.9% | Medium
354 | Russian Doll Envelopes | 31.1% | Hard
355 | Design Twitter | 23.8% | Medium
356 | Line Reflection | 29.2% | Medium
357 | Count Numbers with Unique Digits | 44.5% | Medium
358 | Rearrange String k Distance Apart | 31.1% | Hard
359 | Logger Rate Limiter | 57.4% | Easy
360 | Sort Transformed Array | 42.3% | Medium
361 | Bomb Enemy | 37.4% | Medium
362 | Design Hit Counter | 51.5% | Medium
363 | Max Sum of Rectangle No Larger Than K | 31.3% | Hard
364 | Nested List Weight Sum II | 49.6% | Medium
365 | Water and Jug Problem | 25.6% | Medium
366 | Find Leaves of Binary Tree | 56.3% | Medium
367 | Valid Perfect Square | 36.9% | Medium
368 | Largest Divisible Subset | 32.4% | Medium
369 | Plus One Linked List | 51.8% | Medium
370 | Range Addition | 52.5% | Medium
371 | Sum of Two Integers | 51.6% | Easy
372 | Super Pow | 32.5% | Medium
373 | Find K Pairs with Smallest Sums | 29.0% | Medium
374 | Guess Number Higher or Lower | 32.9% | Easy
375 | Guess Number Higher or Lower II | 34.0% | Medium
376 | Wiggle Subsequence | 34.2% | Medium
377 | Combination Sum IV | 41.1% | Medium
378 | Kth Smallest Element in a Sorted Matrix | 42.6% | Medium
379 | Design Phone Directory | 28.1% | Medium
380 | Insert Delete GetRandom O(1) | 37.1% | Hard
381 | Insert Delete GetRandom O(1) - Duplicates allowed | 26.9% | Hard
382 | Linked List Random Node | 45.8% | Medium
383 | Ransom Note | 45.5% | Easy
384 | Shuffle an Array | 44.6% | Medium
385 | Mini Parser | 29.2% | Medium
386 | Lexicographical Numbers | 38.0% | Medium
387 | First Unique Character in a String | 44.6% | Easy
388 | Longest Absolute File Path | 33.5% | Medium
389 | Find the Difference | 49.9% | Easy
390 | Elimination Game | 35.3% | Medium
391 | Perfect Rectangle | 22.1% | Hard
392 | Is Subsequence | 43.9% | Medium
393 | UTF-8 Validation | 35.0% | Medium
394 | Decode String | 39.7% | Medium
395 | Longest Substring with At Least K Repeating Characters | 34.9% | Medium
396 | Rotate Function | 29.6% | Easy
397 | Integer Replacement | 28.5% | Medium
398 | Random Pick Index | 37.6% | Medium
399 | Evaluate Division | 38.5% | Medium
400 | Nth Digit | 30.2% | Easy
401 | Binary Watch | 43.0% | Easy
402 | Remove K Digits | 25.6% | Medium
403 | Frog Jump | 30.0% | Hard
404 | Sum of Left Leaves | 45.5% | Easy
405 | Convert a Number to Hexadecimal | 40.8% | Easy
406 | Queue Reconstruction by Height | 53.8% | Medium
407 | Trapping Rain Water II | 34.8% | Hard
408 | Valid Word Abbreviation | 26.6% | Easy
409 | Longest Palindrome | 43.7% | Easy
410 | Split Array Largest Sum | 29.5% | Hard
411 | Minimum Unique Word Abbreviation | 30.3% | Hard
412 | Fizz Buzz | 57.8% | Easy
413 | Arithmetic Slices | 53.9% | Medium
414 | Third Maximum Number | 26.3% | Easy
415 | Add Strings | 41.4% | Easy
416 | Partition Equal Subset Sum | 36.7% | Medium
417 | Pacific Atlantic Water Flow | 31.8% | Medium
418 | Sentence Screen Fitting | 25.7% | Medium
419 | Battleships in a Board | 60.2% | Medium
420 | Strong Password Checker | 22.3% | Hard
421 | Maximum XOR of Two Numbers in an Array | 37.5% | Medium
422 | Valid Word Square | 36.3% | Easy
423 | Reconstruct Original Digits from English | 41.0% | Medium
424 | Longest Repeating Character Replacement | 38.8% | Medium
425 | Word Squares | 39.5% | Hard
432 | All O`one Data Structure | 26.9% | Hard
435 | Non-overlapping Intervals | 39.5% | Medium
436 | Find Right Interval | 42.5% | Medium
437 | Path Sum III | 38.2% | Easy
438 | Find All Anagrams in a String | 33.4% | Easy
439 | Ternary Expression Parser | 47.5% | Medium
440 | K-th Smallest in Lexicographical Order | 19.4% | Hard
441 | Arranging Coins | 36.8% | Easy
444 | Sequence Reconstruction | 19.2% | Medium
446 | Arithmetic Slices II - Subsequence | 17.9% | Hard
447 | Number of Boomerangs | 40.0% | Easy
452 | Minimum Number of Arrows to Burst Balloons | 42.4% | Medium
453 | Minimum Moves to Equal Array Elements | 44.9% | Easy