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401K

# Title Difficulty Acceptance Solution
1 80 Remove Duplicates from Sorted Array II Medium 40.1% Solution
2 114 Flatten Binary Tree to Linked List Medium 42.0% Solution
3 173 Binary Search Tree Iterator Medium 48.2% Solution
4 203 Remove Linked List Elements Easy 35.7% Solution
5 228 Summary Ranges Medium 35.7% Solution
6 404 Sum of Left Leaves Easy 49.0% Solution
7 430 Flatten a Multilevel Doubly Linked List Medium 41.7% Solution
8 436 Find Right Interval Medium 42.6% Solution
9 438 Find All Anagrams in a String Medium 37.1% Solution
10 539 Minimum Time Difference Medium 47.8% Solution
11 559 Maximum Depth of N-ary Tree Easy 65.3% Solution
12 784 Letter Case Permutation Easy 56.2% Solution
13 830 Positions of Large Groups Easy 47.6% Solution
14 697 Degree of an Array Easy 50.0% Solution
15 79 Word Search Medium 31.0% Solution
16 50 Pow(x, n) Medium 27.9% Solution
17 1021 Remove Outermost Parentheses Easy 77.4% Solution
18 202 Happy Number Easy 44.9% Solution
19 226 Invert Binary Tree Easy 57.9% Solution
20 637 Average of Levels in Binary Tree Easy 58.5% Solution
21 621 Task Scheduler Medium 45.2% Solution
22 961 N-Repeated Element in Size 2N Array Easy 72.6% Solution
23 583 Delete Operation for Two Strings Medium 44.6% Solution
24 523 Continuous Subarray Sum Medium 24.2% Solution
25 461 Hamming Distance Easy 70.2% Solution
26 1018 Binary Prefix Divisible By 5 Easy 45.9% Solution
27 566 Reshape the Matrix Easy 58.7% Solution
28 275 H-Index II Medium 35.4% Solution
29 179 Largest Number Medium 25.6% Solution
30 911 Online Election Med B41A ium 46.2% Solution
31 257 Binary Tree Paths Easy 45.7% Solution
32 371 Sum of Two Integers Easy 51.0% Solution
33 463 Island Perimeter Easy 60.7% Solution
34 645 Set Mismatch Easy 40.5% Solution
35 392 Is Subsequence Easy 46.6% Solution
36 985 Sum of Even Numbers After Queries Easy 64.6% Solution
37 263 Ugly Number Easy 40.5% Solution
38 93 Restore IP Addresses Medium 31.3% Solution
39 125 Valid Palindrome Easy 30.9% Solution
40 205 Isomorphic Strings Easy 37.2% Solution
41 504 Base 7 Easy 44.8% Solution
42 230 Kth Smallest Element in a BST Medium 51.1% Solution
43 448 Find All Numbers Disappeared in an Array Easy 53.2% Solution
44 435 Non-overlapping Intervals Medium 41.5% Solution
45 343 Integer Break Medium 47.7% Solution
46 395 Longest Substring with At Least K Repeating Characters Medium 38.5% Solution
47 14 Longest Common Prefix Easy 33.4% Solution
48 674 Longest Continuous Increasing Subsequence Easy 44.2% Solution
49 844 Backspace String Compare Easy 45.8% Solution
50 1024 Video Stitching Medium 47.4% Solution
51 389 Find the Difference Easy 53.0% Solution
52 350 Intersection of Two Arrays II Easy 47.6% Solution
53 690 Employee Importance Easy 53.9% Solution
54 530 Minimum Absolute Difference in BST Easy 50.3% Solution
55 1017 Convert to Base -2 Medium 55.6% Solution
56 386 Lexicographical Numbers Medium 45.7% Solution
57 823 Binary Trees With Factors Medium 32.3% Solution
58 121 Best Time to Buy and Sell Stock Easy 47.0% Solution
59 890 Find and Replace Pattern Medium 70.8% Solution
60 33 Search in Rotated Sorted Array Medium 32.9% Solution
61 331 Verify Preorder Serialization of a Binary Tree Medium 38.5% Solution
62 808 Soup Servings Medium 37.0%
63 884 Uncommon Words from Two Sentences Easy 60.7% Solution
64 401 Binary Watch Easy 45.3% Solution
65 17 Letter Combinations of a Phone Number Medium 41.3% Solution
66 220 Contains Duplicate III Medium 19.7% Solution
67 704 Binary Search Easy 47.2% Solution
68 565 Array Nesting Medium 52.4% Solution
69 55 Jump Game Medium 31.8% Solution
70 212 Word Search II Hard 28.4% Solution
71 329 Longest Increasing Path in a Matrix Hard 39.8% Solution
72 78 Subsets Medium 52.5% Solution
73 332 Reconstruct Itinerary Medium 31.3% Solution
74 307 Range Sum Query - Mutable Medium 28.4% Solution
75 218 The Skyline Problem Hard 31.6% Solution
76 56 Merge Intervals Medium 35.5% Solution
77 509 Fibonacci Number Easy 66.7% Solution
78 1026 Maximum Difference Between Node and Ancestor Medium 58.5% Solution
79 983 Minimum Cost For Tickets Medium 57.2% Solution
80 814 Binary Tree Pruning Medium 70.8% Solution
81 912 Sort an Array Medium 64.0% Solution
82 19 Remove Nth Node From End of List Medium 34.2% Solution
83 773 Sliding Puzzle Hard 52.1% Solution
84 1028 Recover a Tree From Preorder Traversal Hard 72.0% Solution
85 452 Minimum Number of Arrows to Burst Balloons Medium 46.3% Solution
86 433 Minimum Genetic Mutation Medium 38.0% Solution
87 817 Linked List Components Medium 54.6% Solution
88 71 Simplify Path Medium 28.7% Solution
89 208 Implement Trie (Prefix Tree) Medium 38.3% Solution
90 260 Single Number III Medium 56.9% Solution
91 136 Single Number Easy 60.0% Solution
92 587 Erect the Fence Hard 34.4% Solution
93 560 Subarray Sum Equals K Medium 42.2% Solution
94 396 Rotate Function Medium 35.2% Solution
95 388 Longest Absolute File Path Medium 39.3% Solution
96 867 Transpose Matrix Easy 64.0% Solution
97 424 Longest Repeating Character Replacement Medium 44.2% Solution
98 907 Sum of Subarray Minimums Medium 27.5% Solution
99 84 Largest Rectangle in Histogram Hard 31.4% Solution
100 11 Container With Most Water Medium 45.1% Solution
101 832 Flipping an Image Easy 72.8% Solution
102 238 Product of Array Except Self Medium 55.4% Solution
103 987 Vertical Order Traversal of a Binary Tree Medium 31.9% Solution
104 486 Predict the Winner Medium 46.8% Solution
105 86 Partition List Medium 37.5% Solution
106 46 Permutations Medium 55.7% Solution
107 599 Minimum Index Sum of Two Lists Easy 48.2% Solution
108 707 Design Linked List Easy 21.6% Solution
109 795 Number of Subarrays with Bounded Maximum Medium 43.4% Solution
110 160 Intersection of Two Linked Lists Easy 34.3% Solution
111 738 Monotone Increasing Digits Medium 42.0% Solution
112 520 Detect Capital Easy 52.5% Solution
113 914 X of a Kind in a Deck of Cards Easy 34.1% Solution
114 460 LFU Cache Hard 29.0% Solution
115 146 LRU Cache Medium 25.9% Solution
116 468 Validate IP Address Medium 21.4% Solution
117 1023 Camelcase Matching Medium 56.6% Solution
118 58 Length of Last Word Easy 32.3% Solution
119 409 Longest Palindrome Easy 48.2% Solution
120 166 Fraction to Recurring Decimal Medium 19.6% Solution
121 1093 Statistics from a Large Sample Medium 41.1% Solution
122 896 Monotonic Array Easy 55.4% Solution
123 201 Bitwise AND of Numbers Range Medium 36.1% Solution
124 746 Min Cost Climbing Stairs Easy 47.5% Solution
125 70 Climbing Stairs Easy 44.4% Solution
126 53 Maximum Subarray Easy 43.8% Solution
127 931 Minimum Falling Path Sum Medium 58.9% Solution
128 647 Palindromic Substrings Medium 57.3% Solution
129 413 Arithmetic Slices Medium 56.0% Solution
130 712 Minimum ASCII Delete Sum for Two Strings Medium 54.8% Solution
131 1105 Filling Bookcase Shelves Medium 51.5% Solution
132 122 Best Time to Buy and Sell Stock II Easy 52.3% Solution
133 646 Maximum Length of Pair Chain Medium 49.1% Solution
134 714 Best Time to Buy and Sell Stock with Transaction Fee Medium 50.7% Solution
135 62 Unique Paths Medium 48.1% Solution
136 347 Top K Frequent Elements Medium 55.5% Solution
137 215 Kth Largest Element in an Array Medium 48.5% Solution
138 192 Word Frequency Medium 26.8% Solution
139 692 Top K Frequent Words Medium 46.2% Solution
140 973 K Closest Points to Origin Medium 62.0% Solution
141 451 Sort Characters By Frequency Medium 56.5% Solution
142 225 Implement Stack using Queues Easy 39.8% Solution
143 232 Implement Queue using Stacks Easy 43.9% Solution
144 1002 Find Common Characters Easy 65.7% Solution
145 242 Valid Anagram Easy 52.7% Solution
146 49 Group Anagrams Medium 47.7% Solution
147 399 Evaluate Division Medium 47.9% Solution
148 919 Complete Binary Tree Inserter Medium 55.3% Solution
149 102 Binary Tree Level Order Traversal Medium 49.1% Solution
150 589 N-ary Tree Preorder Traversal Easy 68.0% Solution
151 910 Smallest Range II Medium 24.1% Solution
152 397 Integer Replacement Medium 31.6% Solution
153 73 Set Matrix Zeroes Medium 40.2% Solution
154 1116 Print Zero Even Odd Medium 38.9% Solution
155 1115 Print FooBar Alternately Medium 48.7% Solution
156 1114 Print in Order Easy 59.0% Solution
157 69 Sqrt(x) Easy 31.6% Solution
158 229 Majority Element II Medium 32.5% Solution
159 169 Majority Element Easy 53.2% Solution
160 590 N-ary Tree Postorder Traversal Easy 68.0% Solution
161 61 Rotate List Medium 27.5% Solution
162 48 Rotate Image Medium 49.4% Solution
163 23 Merge k Sorted Lists Hard 35.1% Solution
164 77 Combinations Medium 48.5% Solution
165 39 Combination Sum Medium 49.4% Solution
166 216 Combination Sum III Medium 52.1% Solution
167 124 Binary Tree Maximum Path Sum Hard 30.4% Solution
168 112 Path Sum Easy 38.2% Solution
169 113 Path Sum II Medium 41.3% Solution
170 133 Clone Graph Medium 27.2% Solution
171 398 Random Pick Index Medium 50.5% Solution
172 119 Pascal's Triangle II Easy 44.3% Solution
173 2 Add Two Numbers Medium 31.4% Solution
174 206 Reverse Linked List Easy 55.6% Solution
175 92 Reverse Linked List II Medium 35.4% Solution
176 25 Reverse Nodes in k-Group Hard 37.1% Solution
177 24 Swap Nodes in Pairs Medium 45.4% Solution
178 977 Squares of a Sorted Array Easy 72.1% Solution
179 116 Populating Next Right Pointers in Each Node Medium 38.5% Solution
180 117 Populating Next Right Pointers in Each Node II Medium 34.9% Solution
181 3 Longest Substring Without Repeating Characters Medium 28.6% Solution
182 7 Reverse Integer Easy 25.4% Solution
183 8 String to Integer (atoi) Medium 14.7% Solution
184 9 Palindrome Number Easy 44.0% Solution
185 6 ZigZag Conversion Medium 32.5% Solution
186 1 Two Sum Easy 44.3% Solution
187 5 Longest Palindromic Substring Medium 27.6% Solution
188 63 Unique Paths II Medium 33.6% Solution
189 64 Minimum Path Sum Medium 47.6% Solution
190 72 Edit Distance Hard 38.4% Solution
191 91 Decode Ways Medium 22.5% Solution
192 139 Word Break Medium 35.9% Solution
193 140 Word Break II Hard 27.7% Solution
194 20 Valid Parentheses Easy 36.8% Solution
195 22 Generate Parentheses Medium 55.8% Solution
196 28 Implement strStr() Easy 32.4% Solution
197 213 House Robber II Medium 35.4% Solution
198 221 Maximal Square Medium 33.5% Solution
199 34 Find First and Last Position of Element in Sorted Array Medium 33.8% Solution
200 47 Permutations II Medium 41.2% Solution
201 300 Longest Increasing Subsequence Medium 41.1% Solution
202 279 Perfect Squares Medium 42.5% Solution
203 120 Triangle Medium 40.0% Solution
204 322 Coin Change Medium 31.1% Solution
205 1027 Longest Arithmetic Sequence Medium 48.6% Solution
206 357 Count Numbers with Unique Digits Medium 47.2% Solution
207 207 Course Schedule Medium 38.5% Solution
208 210 Course Schedule II Medium 35.5% Solution
209 74 Search a 2D Matrix Medium 35.1% Solution
210 98 Validate Binary Search Tree Medium 26.0% Solution
211 1081 Smallest Subsequence of Distinct Characters Medium 43.1% Solution
212 836 Rectangle Overlap Easy 46.9% Solution
213 779 K-th Symbol in Grammar Medium 37.6% Solution
214 496 Next Greater Element I Easy 60.0% Solution
215 503 Next Greater Element II Medium 51.6% Solution
216 152 Maximum Product Subarray Medium 29.6% Solution
217 60 Permutation Sequence Medium 33.6% Solution
218 30 Substring with Concatenation of All Words Hard 23.9% Solution
219 76 Minimum Window Substring Hard 31.4% Solution
220 567 Permutation in String Medium 38.7% Solution
221 978 Longest Turbulent Subarray Medium 45.6% Solution
222 1004 Max Consecutive Ones III Medium 53.8% Solution
223 1052 Grumpy Bookstore Owner Medium 52.8% Solution
224 239 Sliding Window Maximum Hard 38.7% Solution
225 480 Sliding Window Median Hard 33.2% Solution
226 75 Sort Colors Medium 42.7% Solution
227 101 Symmetric Tree Easy 43.9% Solution
228 83 Remove Duplicates from Sorted List Easy 43.0% Solution
229 82 Remove Duplicates from Sorted List II Medium 33.6% Solution
230 42 Trapping Rain Water Hard 43.9% Solution
231 26 Remove Duplicates from Sorted Array Easy 41.3% Solution
232 81 Search in Rotated Sorted Array II Medium 32.7% Solution
233 200 Number of Islands Medium 42.2% Solution
234 148 Sort List Medium 36.3% Solution
235 394 Decode String Medium 45.6% Solution
236 141 Linked List Cycle Easy 37.6% Solution
237 142 Linked List Cycle II Medium 32.8% Solution
238 287 Find the Duplicate Number Medium 50.4% Solution
239 145 Binary Tree Postorder Traversal Hard 49.4% Solution
240 684 Redundant Connection Medium 52.6% Solution
241 547 Friend Circles Medium 54.3% Solution
242 130 Surrounded Regions Medium 23.4% Solution
243 648 Replace Words Medium 52.6% Solution
244 128 Longest Consecutive Sequence Hard 42.3% Solution
245 1019 Next Greater Node In Linked List Medium 56.9% Solution
246 901 Online Stock Span Medium 50.1% Solution
247 40 Combination Sum II Medium 42.6% Solution
248 90 Subsets II Medium 43.1% Solution
249 51 N-Queens Hard 40.4% Solution
250 52 N-Queens II Hard 52.9% Solution
251 127 Word Ladder Medium 24.9% Solution
252 126 Word Ladder II Hard 18.3% Solution
253 542 01 Matrix Medium 36.4% Solution
254 36 Valid Sudoku Medium 44.0% Solution
255 37 Sudoku Solver Hard 38.0% Solution
256 841 Keys and Rooms Medium 60.8% Solution
257 934 Shortest Bridge Medium 44.4% Solution
258 675 Cut Off Trees for Golf Event Hard 31.2% Solution
259 698 Partition to K Equal Sum Subsets Medium 43.0% Solution
260 416 Partition Equal Subset Sum Medium 41.2% Solution
261 131 Palindrome Partitioning Medium 42.0% Solution
262 842 Split Array into Fibonacci Sequence Medium 35.1% Solution
263 752 Open the Lock Medium 46.9% Solution
264 695 Max Area of Island Medium 58.1% Solution
265 224 Basic Calculator Hard 33.5% Solution
266 227 Basic Calculator II Medium 34.1% Solution
267 282 Expression Add Operators Hard 33.2% Solution
268 241 Different Ways to Add Parentheses Medium 50.9% Solution
269 395 Longest Substring with At Least K Repeating Characters Medium 39.1% Solution
270 4 Median of Two Sorted Arrays Hard 27.0% Solution
271 153 Find Minimum in Rotated Sorted Array Medium 43.4% Solution
272 154 Find Minimum in Rotated Sorted Array II Hard 39.6% Solution
273 162 Find Peak Element Medium 41.6% Solution
274 852 Peak Index in a Mountain Array Easy 70.0% Solution
275 309 Best Time to Buy and Sell Stock with Cooldown Medium 44.6% Solution
276 673 Number of Longest Increasing Subsequence Medium 34.0% Solution
277 1155 Number of Dice Rolls With Target Sum Medium 49.8% Solution
278 877 Stone Game Medium 62.0% Solution
279 464 Can I Win Medium 27.7% Solution
280 375 Guess Number Higher or Lower II Medium 38.3% Solution
281 104 Maximum Depth of Binary Tree Easy 61.7% Solution
282 111 Minimum Depth of Binary Tree Easy 35.7% Solution
283 110 Balanced Binary Tree Easy 41.5% Solution
284 572 Subtree of Another Tree Easy 42.0% Solution
285 965 Univalued Binary Tree Easy 66.9% Solution
286 107 Binary Tree Level Order Traversal II Easy 47.9% Solution
287 429 N-ary Tree Level Order Traversal Easy 60.4% Solution
288 872 Leaf-Similar Trees Easy 63.8% Solution
289 669 Trim a Binary Search Tree Easy 60.8% Solution
290 938 Range Sum of BST Easy 78.1% Solution
291 297 Serialize and Deserialize Binary Tree Hard 42.5% Solution
292 339 Nested List Weight Sum Easy 69.6% Solution
293 364 Nested List Weight Sum II Medium 59.1% Solution
294 269 Alien Dictionary Hard 32.1% Solution
295 953 Verifying an Alien Dictionary Easy 56.0% Solution
296 252 Meeting Rooms Easy 52.8% Solution
297 253 Meeting Rooms II Medium 43.5% Solution
298 680 Valid Palindrome II Easy 34.9% Solution
299 301 Remove Invalid Parentheses Hard 40.2% Solution
300 273 Integer to English Words Hard 24.9% Solution
301 67 Add Binary Easy 40.4% Solution
302 721 Accounts Merge Medium 42.4% Solution
303 785 Is Graph Bipartite? Medium 44.5% Solution
304 426 Convert Binary Search Tree to Sorted Doubly Linked List Medium 54.1% Solution
305 278 First Bad Version Easy 31.2% Solution
306 340 Longest Substring with At Most K Distinct Characters Hard 40.9% Solution
307 825 Friends Of Appropriate Ages Medium 37.9% Solution
308 986 Interval List Intersections Medium 63.9% Solution
309 199 Binary Tree Right Side View Medium 49.4% Solution
310 349 Intersection of Two Arrays Easy 56.6% Solution
311 161 One Edit Distance Medium 31.9% Solution
312 314 Binary Tree Vertical Order Traversal Medium 41.9% Solution
313 958 Check Completeness of a Binary Tree Medium 48.7% Solution
314 88 Merge Sorted Array Easy 36.8% Solution
315 65 Valid Number Hard 14.3% Solution
316 317 Shortest Distance from All Buildings Hard 38.9% Solution
317 158 Read N Characters Given Read4 II - Call multiple times Hard 27.9% Solution
318 31 Next Permutation Medium 31.0% Solution
319 304 Range Sum Query 2D - Immutable Medium 34.0% Solution
320 311 Sparse Matrix Multiplication Medium 57.5% Solution
321 211 Add and Search Word - Data structure design Medium 31.8% Solution
322 543 Diameter of Binary Tree Easy 47.4% Solution
323 689 Maximum Sum of 3 Non-Overlapping Subarrays Hard 44.4% Solution
324 43 Multiply Strings Medium 31.5% Solution
325 708 Insert into a Cyclic Sorted List Medium 30.2% Solution
326 109 Convert Sorted List to Binary Search Tree Medium 42.5% Solution
327 138 Copy List with Random Pointer Medium 28.8% Solution
328 295 Find Median from Data Stream Hard 38.5% Solution
329 21 Merge Two Sorted Lists Easy 48.9% Solution
330 863 All Nodes Distance K in Binary Tree Medium 50.1% Solution
331 525 Contiguous Array Medium 43.4% Solution
332 234 Palindrome Linked List Easy 37.0% Solution
333 268 Missing Number Easy 49.3% Solution
334 402 Remove K Digits Medium 27.0% Solution
335 85 Maximal Rectangle Hard 34.6% Solution
336 380 Insert Delete GetRandom O(1) Medium 43.8% Solution
337 381 Insert Delete GetRandom O(1) - Duplicates allowed Hard 32.7% Solution
338 415 Add Strings Easy 44.7% Solution
339 270 Closest Binary Search Tree Value Easy 44.8% Solution
340 236 Lowest Common Ancestor of a Binary Tree Medium 39.7% Solution
341 15 3Sum Medium 24.8% Solution
342 632 Smallest Range Covering Elements from K Lists Hard 49.2% Solution
343 157 Read N Characters Given Read4 Easy 30.7% Solution
344 529 Minesweeper Medium 54.5% Solution
345 490 The Maze Medium 48.7% Solution
346 499 The Maze III Hard 38.3% Solution
347 505 The Maze II Medium 45.3% Solution
348 285 Inorder Successor in BST Medium 36.3% Solution
349 498 Diagonal Traverse Medium 46.0% Solution
350 1123 Lowest Common Ancestor of Deepest Leaves Medium 64.2% Solution
351 261 Graph Valid Tree Medium 40.5% Solution
352 159 Longest Substring with At Most Two Distinct Characters Hard 47.9% Solution
353 240 Search a 2D Matrix II Medium 41.5% Solution
354 10 Regular Expression Matching Hard 25.7% Solution
355 885 Spiral Matrix III Medium 65.8% Solution
356 246 Strobogrammatic Number Easy 43.1% Solution
357 143 Reorder List Medium 32.5% Solution
358 824 Goat Latin Easy 58.7% Solution
359 540 Single Element in a Sorted Array Medium 57.5% Solution
360 536 Construct Binary Tree from String Medium 46.3% Solution
361 1146 Snapshot Array Medium 32.5% Solution
362 636 Exclusive Time of Functions Medium 49.5% Solution
363 29 Divide Two Integers Medium 16.2% Solution
364 286 Walls and Gates Medium 50.7% Solution
365 283 Move Zeroes Easy 55.2% Solution
366 549 Binary Tree Longest Consecutive Sequence II Medium 45.0% Solution
367 743 Network Delay Time Medium 44.2% Solution
368 865 Smallest Subtree with all the Deepest Nodes Medium 57.7% Solution
369 1094 Car Pooling Medium 57.1% Solution
370 528 Random Pick with Weight Medium 43.0% Solution
371 Lint183 Wood Cut Hard 27% Solution
372 719 Find K-th Smallest Pair Distance Hard 30.0% Solution
373 97 Interleaving String Hard 29.1% Solution
374 494 Target Sum Medium 45.8% Solution
375 1055 Shortest Way to Form String Medium 57.7% Solution
376 1047 Remove All Adjacent Duplicates In String Easy 64.7% Solution
377 1209 Remove All Adjacent Duplicates in String II Medium 58.1% Solution
378 1143 Longest Common Subsequence Medium 57.1% Solution
379 1057 Campus Bikes Medium 58.4% Solution
380 1066 Campus Bikes II Hard 52.8% Solution
381 1088 Confusing Number II Hard 35.4% Solution
382 247 Strobogrammatic Number II Medium 45.6% Solution
383 222 Count Complete Tree Nodes Medium 37.7% Solution
384 410 Split Array Largest Sum Hard 43.1% Solution
385 1170 Compare Strings by Frequency of the Smallest Character Easy 59.6% Solution
386 1163 Last Substring in Lexicographical Order Hard 30.3% Solution
386 811 Subdomain Visit Count Easy 66.6% Solution
387 809 Expressive Words Medium 45.0% Solution
388 359 Logger Rate Limiter Easy 67.1% Solution
389 1110 Delete Nodes And Return Forest Medium 64.0% Solution
390 1032 Stream of Characters Hard 45.0% Solution
391 981 Time Based Key-Value Store Medium 51.8% Solution
392 1153 String Transforms Into Another String Hard 33.4% Solution
393 843 Guess the Word Hard 45.1% Solution
394 1087 Brace Expansion Medium 60.2% Solution
395 1096 Brace Expansion II Hard 59.2% Solution
396 1231 Divide Chocolate Hard 49.7% Solution
397 315 Count of Smaller Numbers After Self Hard 39.7% Solution
398 753 Cracking the Safe Hard 48.6% Solution
399 943 Find the Shortest Superstring Hard 40.3% Solution
400 642 Design Search Autocomplete System Hard 40.6% Solution
401 818 Race Car Hard 36.9% Solution
402 947 Most Stones Removed with Same Row or Column Medium 54.8% Solution
403 951 Flip Equivalent Binary Trees Medium 65.1% Solution
404 727 Minimum Window Subsequence Hard 39.0% Solution
405 855 Exam Room Medium 40.0% Solution
406 853 Car Fleet Medium 41.3% Solution
407 857 Minimum Cost to Hire K Workers Hard 48.7% Solution
408 482 License Key Formatting Easy 41.9% Solution
409 489 Robot Room Cleaner Hard 66.7% Solution
410 767 Reorganize String Medium 44.6% Solution
411 935 Knight Dialer Medium 42.6% Solution
412 477 Total Hamming Distance Medium 49.9% Solution
413 32 Longest Valid Parentheses Hard 26.6% Solution
414 277 Find the Celebrity Medium 38.8% Solution
415 342 Power of Four Easy 40.8% Solution
416 ts1 Non-Repeating Random Number Generator Solution
417 ts2 Convert Array to Circular Linked List Solution
418 ts3 Generate Sublists of A Circular Linked List Solution
419 ts4 Convert to Non-Decreasing Array with Minimum Changes Solution
420 ts5 Token Bucket Algorithm Solution
421 1216 Valid Palindrome III Hard 42.0% Solution
422 319 Bulb Switcher Medium 44.6% Solution
423 358 Rearrange String k Distance Apart Hard 33.9% Solution
424 405 Convert a Number to Hexadecimal Easy 42.7% Solution
425 691 Stickers to Spell Word Hard 40.3% Solution
426 670 Maximum Swap Medium 41.1% Solution
427 198 House Robber Easy 41.1% Solution
428 303 Range Sum Query - Immutable Easy 38.4% Solution
429 338 Counting Bits Medium 65.0% Solution
430 921 Minimum Add to Make Parentheses Valid Medium 70.8% Solution
431 742 Closest Leaf in a Binary Tree Medium 41.1% Solution
432 449 Serialize and Deserialize BST Medium 49.3% Solution
433 387 First Unique Character in a String Easy 50.9% Solution
434 312 Burst Balloons Hard 49.0% Solution
434 766 Toeplitz Matrix Easy 62.8% Solution
435 791 Custom Sort String Medium 63.7% Solution
436 266 Palindrome Permutation Easy 60.7% Solution
437 694 Number of Distinct Islands Medium 53.0% Solution
438 419 Battleships in a Board Medium 67.0% Solution
439 129 Sum Root to Leaf Numbers Medium 44.4% Solution
440 1060 Missing Element in Sorted Array Medium 53.4% Solution
441 341 Flatten Nested List Iterator Medium 50.1% Solution
442 325 Maximum Size Subarray Sum Equals k Medium 45.6% Solution
443 1008 Construct Binary Search Tree from Preorder Traversal Medium 74.0% Solution
444 137 Single Number II Medium 47.6% Solution
445 414 Third Maximum Number Easy 29.6% Solution
446 1197 Minimum Knight Moves Medium 30.4% Solution
447 1053 Previous Permutation With One Swap Medium 46.9% Solution
448 249 Group Shifted Strings Medium 50.4% Solution
449 298 Binary Tree Longest Consecutive Sequence Medium 45.2% Solution
450 100 Same Tree Easy 51.1% Solution
451 103 Binary Tree Zigzag Level Order Traversal Medium 43.9% Solution
452 344 Reverse String Easy 64.6% Solution
453 622 Design Circular Queue Medium 41.4% Solution
454 235 Lowest Common Ancestor of a Binary Search Tree Easy 46.9% Solution
455 1249 Minimum Remove to Make Valid Parentheses Medium 58.3% Solution
456 378 Kth Smallest Element in a Sorted Matrix Medium 51.3% Solution
457 328 Odd Even Linked List Medium 51.0% Solution
458 54 Spiral Matrix Medium 31.9% Solution
459 237 Delete Node in a Linked List Easy 56.6% Solution
460 123 Best Time to Buy and Sell Stock III Hard 35.3% Solution
461 778 Swim in Rising Water Hard 49.8% Solution
462 299 Bulls and Cows Easy 40.9% Solution
463 552 Student Attendance Record II Hard 34.6% Solution
464 659 Split Array into Consecutive Subsequence Medium 42.3% Solution

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