I started solving questions on leetcode since Aug, 2018 and only listed the problems I solved twice. More questions will be updated for sure and they can be found at my github repository Algorithm-and-Leetcode
  • 1.Two Sum - 07 November 2018
  • 10. Regular Expression Matching - 07 November 2018
  • 100. Same Tree - 14 November 2018
  • 101. Symmetric Tree - 14 November 2018
  • 102. Binary Tree Level Order Traversal - 14 November 2018
  • 103. Binary Tree Zigzag Level Order Traversal - 15 November 2018
  • 104. Maximum Depth of Binary Tree - 15 November 2018
  • 105. Construct Binary Tree from Preorder and Inorder Traversal - 19 November 2018
  • 106. Construct Binary Tree from Inorder and Postorder Traversal - 16 November 2018
  • 107. Binary Tree Level Order Traversal II - 16 November 2018
  • 108. Convert Sorted Array to Binary Search Tree - 19 November 2018
  • 109. Convert Sorted List to Binary Search Tree - 16 November 2018
  • 11. Container With Most Water - 07 November 2018
  • 110. Balanced Binary Tree - 19 November 2018
  • 111. Minimum Depth of Binary Tree - 19 November 2018
  • 112. Path Sum - 20 November 2018
  • 113. Path Sum II - 20 November 2018
  • 114. Flatten Binary Tree to Linked List - 21 November 2018
  • 115. Distinct Subsequences - 21 November 2018
  • 116. Populating Next Right Pointers in Each Node - 21 November 2018
  • 117. Populating Next Right Pointers in Each Node II - 21 November 2018
  • 118. Pascal's Triangle - 21 November 2018
  • 119. Pascal's Triangle II - 22 November 2018
  • 12. Integer to Roman - 07 November 2018
  • 120. Triangle - 22 November 2018
  • 121. Best Time to Buy and Sell Stock - 23 November 2018
  • 122. Best Time to Buy and Sell Stock II - 23 November 2018
  • 123. Best Time to Buy and Sell Stock III - 25 November 2018
  • 124. Binary Tree Maximum Path Sum - 25 November 2018
  • 125. Valid Palindrome - 25 November 2018
  • 126. Word Ladder II - 19 March 2019
  • 127. Word Ladder - 28 November 2018
  • 128. Longest Consecutive Sequence - 28 November 2018
  • 129. Sum Root to Leaf Numbers - 28 November 2018
  • 13. Roman to Integer - 07 November 2018
  • 130. Surrounded Regions - 28 November 2018
  • 131. Palindrome Partitioning - 19 March 2019
  • 132. Palindrome Partitioning II - 01 December 2018
  • 133. Clone Graph - 01 December 2018
  • 134. Gas Station - 03 December 2018
  • 136. Single Number - 03 December 2018
  • 137. Single Number II - 03 December 2018
  • 138. Copy List with Random Pointer - 07 December 2018
  • 139. Word Break - 07 December 2018
  • 14. Longest Common Prefix - 07 November 2018
  • 140. Word Break II - 07 December 2018
  • 141. Linked List Cycle - 07 December 2018
  • 142. Linked List Cycle II - 07 December 2018
  • 143. Reorder List - 08 December 2018
  • 144. Binary Tree Preorder Traversal - 08 December 2018
  • 145. Binary Tree Postorder Traversal - 08 December 2018
  • 146. LRU Cache - 07 May 2019
  • 147. Insertion Sort List - 08 December 2018
  • 148. Sort List - 13 December 2018
  • 149. Max Points on a Line - 07 May 2019
  • 15. 3Sum - 07 November 2018
  • 150. Evaluate Reverse Polish Notation - 13 December 2018
  • 151. Reverse Words in a String - 14 December 2018
  • 152. Maximum Product Subarray - 16 December 2018
  • 153. Find Minimum in Rotated Sorted Array - 16 December 2018
  • 154. Find Minimum in Rotated Sorted Array II - 17 December 2018
  • 155. Min Stack - 17 December 2018
  • 157. Read N Characters Given Read4 - 07 May 2019
  • 158. Read N Characters Given Read4 II - Call multiple times - 07 May 2019
  • 16. 3Sum Closest - 07 November 2018
  • 160. Intersection of Two Linked Lists - 17 December 2018
  • 162. Find Peak Element - 18 December 2018
  • 164. Maximum Gap - 18 December 2018
  • 165. Compare Version Numbers - 18 December 2018
  • 166. Fraction to Recurring Decimal - 20 December 2018
  • 167. Two Sum II - Input array is sorted - 18 December 2018
  • 168. Excel Sheet Column Title - 18 December 2018
  • 169. Majority Element - 21 December 2018
  • 17. Letter Combinations of a Phone Number - 07 November 2018
  • 170. Two Sum III - Data structure design - 07 May 2019
  • 171. Excel Sheet Column Number - 21 December 2018
  • 172. Factorial Trailing Zeroes - 21 December 2018
  • 173. Binary Search Tree Iterator - 21 December 2018
  • 174. Dungeon Game - 07 May 2019
  • 175. Combine Two Tables - 22 December 2018
  • 176. Second Highest Salary - 23 December 2018
  • 177. Nth Highest Salary - 22 December 2018
  • 178. Rank Scores - 22 December 2018
  • 179. Largest Number - 24 December 2018
  • 18. 4Sum - 07 November 2018
  • 180. Consecutive Numbers - 24 December 2018
  • 181. Employees Earning More Than Their Managers - 21 December 2018
  • 182. Duplicate Emails - 21 December 2018
  • 183. Customers Who Never Order - 21 December 2018
  • 184. Department Highest Salary - 21 December 2018
  • 185. Department Top Three Salaries - 21 December 2018
  • 187. Repeated DNA Sequences - 21 December 2018
  • 189. Rotate Array - 06 January 2018
  • 19. Remove Nth Node From End of List - 07 November 2018
  • 190. Reverse Bits - 06 January 2018
  • 191. Number of 1 Bits - 06 January 2018
  • 198. House Robber - 06 January 2018
  • 199. Binary Tree Right Side View - 06 January 2018
  • 2. Add Two Numbers - 07 November 2018
  • 20. Valid Parentheses - 07 November 2018
  • 200. Number of Islands - 06 January 2018
  • 201. Bitwise AND of Numbers Range - 07 January 2018
  • 202. Happy Number - 07 January 2018
  • 203. Remove Linked List Elements - 07 January 2019
  • 204. Count Primes - 08 January 2019
  • 205. Isomorphic Strings - 08 January 2019
  • 206. Reverse Linked List - 08 January 2019
  • 207. Course Schedule - 09 January 2019
  • 208. Implement Trie (Prefix Tree) - 10 January 2019
  • 209. Minimum Size Subarray Sum - 10 January 2019
  • 21. Merge Two Sorted Lists - 07 November 2018
  • 210. Course Schedule II - 10 January 2019
  • 211. Add and Search Word - Data structure design - 10 January 2019
  • 212. Word Search II - 10 January 2019
  • 213. House Robber II - 15 January 2019
  • 214. Shortest Palindrome - 15 January 2019
  • 215. Kth Largest Element in an Array - 15 January 2019
  • 216. Combination Sum III - 15 January 2019
  • 217. Contains Duplicate - 15 January 2019
  • 219. 496. Next Greater Element I - 08 May 2019
  • 219. Contains Duplicate II - 19 January 2019
  • 22. Generate Parentheses - 07 November 2018
  • 220. Contains Duplicate III - 21 January 2019
  • 221. Maximal Square - 22 January 2019
  • 222. Count Complete Tree Nodes - 22 January 2019
  • 223. Rectangle Area - 21 January 2019
  • 224. Basic Calculator - 02 February 2019
  • 225. Implement Stack using Queues - 02 February 2019
  • 226. Invert Binary Tree - 04 February 2019
  • 227. Basic Calculator II - 04 February 2019
  • 228. Summary Ranges - 04 February 2019
  • 229. Majority Element II - 09 February 2019
  • 23. Merge k Sorted Lists - 07 November 2018
  • 230. Kth Smallest Element in a BST - 09 February 2019
  • 231. Power of Two - 09 February 2019
  • 232. Implement Queue using Stacks - 10 February 2019
  • 234. Palindrome Linked List - 10 February 2019
  • 235. Lowest Common Ancestor of a Binary Search Tree - 10 February 2019
  • 236. Lowest Common Ancestor of a Binary Tree - 12 February 2019
  • 237. Delete Node in a Linked List - 12 February 2019
  • 238. Product of Array Except Self - 12 February 2019
  • 239. Sliding Window Maximum - 12 February 2019
  • 24. Swap Nodes in Pairs - 07 November 2018
  • 240. Search a 2D Matrix II - 12 February 2019
  • 241. Different Ways to Add Parentheses - 12 February 2019
  • 242. Valid Anagram - 16 February 2019
  • 25. Reverse Nodes in k-Group - 07 November 2018
  • 250. Count Univalue Subtrees - 10 May 2019
  • 252. Meeting Rooms - 07 May 2019
  • 253. Meeting Rooms II - 07 May 2019
  • 257. Binary Tree Paths - 17 February 2019
  • 258. Add Digits - 17 February 2019
  • 26. Remove Duplicates from Sorted Array - 07 November 2018
  • 261. Graph Valid Tree - 07 May 2019
  • 263. Ugly Number - 21 February 2019
  • 264. Ugly Number II - 21 February 2019
  • 268. Missing Number - 21 February 2019
  • 269. Alien Dictionary - 07 May 2019
  • 27. Remove Element - 07 November 2018
  • 270. Closest Binary Search Tree Value - 07 May 2019
  • 273. Integer to English Words - 07 May 2019
  • 274. H-Index - 22 February 2019
  • 275. H-Index II - 22 February 2019
  • 276. Paint Fence - 22 February 2019
  • 277. Find the Celebrity - 07 May 2019
  • 278. First Bad Version - 22 February 2019
  • 279. Perfect Squares - 24 February 2019
  • 28. Implement strStr() - 07 November 2018
  • 280. Wiggle Sort - 24 February 2019
  • 282. Expression Add Operators - 24 February 2019
  • 283. Move Zeroes - 24 February 2019
  • 284. Peeking Iterator - 24 February 2019
  • 285. Inorder Successor in BST - 08 May 2019
  • 285. Inorder Successor in BST - 08 May 2019
  • 287. Find the Duplicate Number - 24 February 2019
  • 289. Game of Life - 28 February 2019
  • 29. Divide Two Integers - 07 November 2018
  • 290. Word Pattern - 28 February 2019
  • 292. Nim Game - 28 February 2019
  • 295.Find Median from Data Stream - 28 February 2019
  • 297. Serialize and Deserialize Binary Tree - 01 March 2019
  • 299. Bulls and Cows - 01 March 2019
  • 3. Longest Substring Without Repeating Characters - 07 November 2018
  • 30. Substring with Concatenation of All Words - 07 November 2018
  • 300. Longest Increasing Subsequence - 01 March 2019
  • 301. Remove Invalid Parentheses - 03 March 2019
  • 303. Range Sum Query - Immutable - 03 March 2019
  • 304. Range Sum Query 2D - Immutable - 03 March 2019
  • 305. Number Of Island II - 03 March 2019
  • 306. Additive Number - 03 March 2019
  • 307. Range Sum Query - Mutable - 04 March 2019
  • 309. Best Time to Buy and Sell Stock with Cooldown - 04 March 2019
  • 31. Next Permutation - 07 November 2018
  • 310. Minimum Height Trees - 05 March 2019
  • 312. Burst Balloons - 06 March 2019
  • 313. Super Ugly Number - 06 March 2019
  • 314. Binary Tree Vertical Order Traversal - 08 May 2019
  • 315. Count of Smaller Numbers After Self - 06 March 2019
  • 316. Remove Duplicate Letters - 13 May 2019
  • 318. Maximum Product of Word Lengths - 08 May 2019
  • 319. Bulb Switcher - 08 May 2019
  • 32. Longest Valid Parentheses - 07 November 2018
  • 322. Coin Change - 08 May 2019
  • 324. Wiggle Sort II - 08 May 2019
  • 325. Maximum Size Subarray Sum Equals k - 08 May 2019
  • 328. Odd Even Linked List - 08 May 2019
  • 329. Longest Increasing Path in a Matrix - 08 May 2019
  • 33. Search in Rotated Sorted Array - 07 November 2018
  • 331. Verify Preorder Serialization of a Binary Tree - 08 May 2019
  • 332. Reconstruct Itinerary - 08 May 2019
  • 334. Increasing Triplet Subsequence - 08 May 2019
  • 336. Palindrome Pairs - 08 May 2019
  • 337. House Robber III - 08 May 2019
  • 338. Counting Bits - 08 May 2019
  • 339. Nested List Weight Sum - 08 May 2019
  • 34. Find First and Last Position of Element in Sorted Array - 07 November 2018
  • 340. Longest Substring with At Most K Distinct Characters - 09 May 2019
  • 341. Flatten Nested List Iterator - 08 May 2019
  • 342. Power of Four - 08 May 2019
  • 343. Integer Break - 08 May 2019
  • 344. Reverse String - 08 May 2019
  • 345. Reverse Vowels of a String - 08 May 2019
  • 346. Moving Average from Data Stream - 08 May 2019
  • 347. Top K Frequent Elements - 08 May 2019
  • 348. Design Tic-Tac-Toe - 08 May 2019
  • 349. Intersection of Two Arrays - 08 May 2019
  • 35. Search Insert Position - 07 November 2018
  • 350. Intersection of Two Arrays II - 08 May 2019
  • 355. Design Twitter - 08 May 2019
  • 357. Count Numbers with Unique Digits - 08 May 2019
  • 36. Valid Sudoku - 07 November 2018
  • 360. Sort Transfromed Array - 08 May 2019
  • 362. Design Hit Counter - 08 May 2019
  • 364. Nested List Weight Sum II - 08 May 2019
  • 37. Sudoku Solver - 07 November 2018
  • 377. Combination Sum IV - 08 May 2019
  • 378. Kth Smallest Element in a Sorted Matrix - 08 May 2019
  • 38. Count and Say - 07 November 2018
  • 380. Insert Delete GetRandom O(1) - 08 May 2019
  • 382. Linked List Random Node - 10 May 2019
  • 382. Linked List Random Node - 13 May 2019
  • 387. First Unique Character in a String - 08 May 2019
  • 39. Combination Sum - 07 November 2018
  • 392. Is Subsequence - 08 May 2019
  • 393. UTF-8 Validation - 08 May 2019
  • 394. Decode String - 08 May 2019
  • 395. Longest Substring with At Least K Repeating Characters - 08 May 2019
  • 399. Evaluate Division - 08 May 2019
  • 4. Median of Two Sorted Arrays - 07 November 2018
  • 40. Combination Sum II - 07 November 2018
  • 41. First Missing Positive - 07 November 2018
  • 410. Split Array Largest Sum - 08 May 2019
  • 412. Fizz Buzz - 08 May 2019
  • 416. Partition Equal Subset Sum - 08 May 2019
  • 42. Trapping Rain Water - 07 November 2018
  • 426. Convert Binary Search Tree to Sorted Doubly Linked List - 09 May 2019
  • 427. Construct Quad Tree - 10 May 2019
  • 429. N-ary Tree Level Order Traversal - 08 May 2019
  • 43. Multiply Strings - 07 November 2018
  • 435. Non-overlapping Intervals - 08 May 2019
  • 437. Path Sum III - 08 May 2019
  • 438. Find All Anagrams in a String - 08 May 2019
  • 44. Wildcard Matching - 07 November 2018
  • 443. String Compression - 08 May 2019
  • 445. Add Two Numbers II - 08 May 2019
  • 448. Find All Numbers Disappeared in an Array - 10 May 2019
  • 449. Serialize and Deserialize BST - 08 May 2019
  • 45. Jump Game II - 07 November 2018
  • 450. Delete Node in a BST - 08 May 2019
  • 452. Minimum Number of Arrows to Burst Balloons - 08 May 2019
  • 458. Poor Pigs - 10 May 2019
  • 458. Poor Pigs - 13 May 2019
  • 46. Permutations - 07 November 2018
  • 460. LFU Cache - 08 May 2019
  • 468. Validate IP Address - 08 May 2019
  • 47. Permutations II - 07 November 2018
  • 48. Rotate Image - 07 November 2018
  • 489. Robot Room Cleaner - 08 May 2019
  • 49. Group Anagrams - 07 November 2018
  • 490. The Maze - 08 May 2019
  • 494. Target Sum - 08 May 2019
  • 5. Longest Palindromic Substring - 07 November 2018
  • 50. Pow(x, n) - 07 November 2018
  • 501. Find Mode in Binary Search Tree - 08 May 2019
  • 503. Next Greater Element II - 08 May 2019
  • 505. The Maze II - 08 May 2019
  • 508. Most Frequent Subtree Sum - 08 May 2019
  • 509. Fibonacci Number - 09 May 2019
  • 51. N-Queens - 07 November 2018
  • 518. Coin Change 2 - 10 May 2019
  • 52. N-Queens II - 07 November 2018
  • 528. Random Pick with Weight - 08 May 2019
  • 529. Minesweeper - 08 May 2019
  • 53. Maximum Subarray - 07 November 2018
  • 530. Minimum Absolute Difference in BST - 08 May 2019
  • 535. Encode and Decode TinyURL - 08 May 2019
  • 54. Spiral Matrix - 07 November 2018
  • 542. 01 Matrix - 19 March 2019
  • 543. Diameter of Binary Tree - 08 May 2019
  • 546. Remove Boxes - 23 March 2019
  • 547. Friend Circles - 08 May 2019
  • 55. Jump Game - 07 November 2018
  • 56. Merge Intervals - 07 November 2018
  • 564. Find the Closest Palindrome - 09 May 2019
  • 57. Insert Interval - 07 November 2018
  • 572. Subtree of Another Tree - 08 May 2019
  • 576. Out of Boundary Paths - 23 March 2019
  • 58. Length of Last Word - 07 November 2018
  • 583. Delete Operation for Two Strings - 08 May 2019
  • 589. N-ary Tree Preorder Traversal - 08 May 2019
  • 59. Spiral Matrix II - 07 November 2018
  • 590. N-ary Tree Postorder Traversal - 08 May 2019
  • 6. ZigZag Conversion - 07 November 2018
  • 60. Permutation Sequence - 07 November 2018
  • 609. Find Duplicate File in System - 08 May 2019
  • 61. Rotate List - 07 November 2018
  • 617. Merge Two Binary Trees - 08 May 2019
  • 62. Unique Paths - 07 November 2018
  • 621. Task Scheduler - 08 May 2019
  • 63. Unique Paths II - 07 November 2018
  • 635. Design Log Storage System - 13 May 2019
  • 636. Exclusive Time of Functions - 09 May 2019
  • 637. Average of Levels in Binary Tree - 08 May 2019
  • 64. Minimum Path Sum - 07 November 2018
  • 642. Design Search Autocomplete System - 08 May 2019
  • 647. Palindromic Substrings - 08 May 2019
  • 648. Replace Words - 07 March 2019
  • 65. Valid Number - 07 November 2018
  • 653. Two Sum IV - Input is a BST - 08 May 2019
  • 654. Maximum Binary Tree - 08 May 2019
  • 66. Plus One - 07 November 2018
  • 664. Strange Printer - 08 May 2019
  • 668. Kth Smallest Number in Multiplication Table - 08 May 2019
  • 669. Trim a Binary Search Tree - 08 May 2019
  • 67. Add Binary - 07 November 2018
  • 673. Number of Longest Increasing Subsequence - 08 May 2019
  • 675. Cut Off Trees for Golf Event - 19 March 2019
  • 676. Implement Magic Dictionary - 07 March 2019
  • 677. Map Sum Pairs - 07 March 2019
  • 679. 24 Game - 09 May 2019
  • 68. Text Justification - 08 May 2019
  • 683. K Empty Slots - 08 May 2019
  • 684. Redundant Connection - 08 May 2019
  • 685. Redundant Connection II - 08 May 2019
  • 687. Longest Univalue Path - 08 May 2019
  • 688. Knight Probability in Chessboard - 23 March 2019
  • 69. Sqrt(x) - 07 November 2018
  • 692. Top K Frequent Words - 08 May 2019
  • 695. Max Area of Island - 08 May 2019
  • 698. Partition to K Equal Sum Subsets - 19 March 2019
  • 7. Reverse Integer - 07 November 2018
  • 70. Climbing Stairs - 07 November 2018
  • 700. Search in a Binary Search Tree - 08 May 2019
  • 701. Insert into a Binary Search Tree - 08 May 2019
  • 704. Binary Search - 08 May 2019
  • 706. Design HashMap - 08 May 2019
  • 707. Design Linked List - 08 May 2019
  • 71. Simplify Path - 07 November 2018
  • 710. Random Pick with Blacklist - 08 May 2019
  • 712. Minimum ASCII Delete Sum for Two Strings - 08 May 2019
  • 716. Max Stack - 08 May 2019
  • 717. 1-bit and 2-bit Characters - 08 May 2019
  • 719. Find K-th Smallest Pair Distance - 08 May 2019
  • 72. Edit Distance - 07 November 2018
  • 720. Longest Word in Dictionary - 08 March 2019
  • 721. Accounts Merge - 08 May 2019
  • 726. Number of Atoms - 08 May 2019
  • 729. My Calendar I - 08 May 2019
  • 73. Set Matrix Zeroes - 07 November 2018
  • 731. My Calendar II - 08 May 2019
  • 733. Flood Fill - 08 May 2019
  • 735. Asteroid Collision - 08 May 2019
  • 74. Search a 2D Matrix - 07 November 2018
  • 740. Delete and Earn - 08 May 2019
  • 741. Cherry Pickup - 08 May 2019
  • 743. Network Delay Time - 08 May 2019
  • 745. Prefix and Suffix Search - 08 March 2019
  • 746. Min Cost Climbing Stairs - 08 May 2019
  • 75. Sort Colors - 07 November 2018
  • 752. Open the Lock - 19 March 2019
  • 753. Cracking the Safe - 09 May 2019
  • 755. Pour Water - 08 May 2019
  • 759. Employee Free Time - 08 May 2019
  • 76. Minimum Window Substring - 07 November 2018
  • 763. Partition Labels - 08 May 2019
  • 77. Combinations - 07 November 2018
  • 771. Jewels and Stones - 08 May 2019
  • 772. Basic Calculator III - 08 May 2019
  • 773. Sliding Puzzle - 09 May 2019
  • 778. Swim in Rising Water - 08 May 2019
  • 78. Subsets - 07 November 2018
  • 784. Letter Case Permutation - 11 March 2019
  • 784. Letter Case Permutation - 19 March 2019
  • 785. Is Graph Bipartite? - 08 May 2019
  • 786. K-th Smallest Prime Fraction - 08 May 2019
  • 788. Rotated Digits - 08 May 2019
  • 79. Word Search - 07 November 2018
  • 790. Domino and Tromino Tiling - 08 May 2019
  • 792. Number of Matching Subsequences - 08 May 2019
  • 8. String to Integer (atoi) - 07 November 2018
  • 80. Remove Duplicates from Sorted Array II - 07 November 2018
  • 801. Minimum Swaps To Make Sequences Increasing - 08 May 2019
  • 802. Find Eventual Safe States - 08 May 2019
  • 81. Search in Rotated Sorted Array II - 07 November 2018
  • 811. Subdomain Visit Count - 08 May 2019
  • 813. Largest Sum of Averages - 08 May 2019
  • 814. Binary Tree Pruning - 08 May 2019
  • 815. Bus Routes - 08 May 2019
  • 818. Race Car - 08 May 2019
  • 819. Most Common Word - 08 May 2019
  • 82. Remove Duplicates from Sorted List II - 07 November 2018
  • 827. Making A Large Island - 08 May 2019
  • 83. Remove Duplicates from Sorted List - 07 November 2018
  • 833. Find And Replace in String - 08 May 2019
  • 836. Rectangle Overlap - 08 May 2019
  • 839. Similar String Groups - 08 May 2019
  • 84. Largest Rectangle in Histogram - 07 November 2018
  • 841. Keys and Rooms - 08 May 2019
  • 842. Split Array into Fibonacci Sequence - 19 March 2019
  • 843. Guess the Word - 08 May 2019
  • 844. Backspace String Compare - 08 May 2019
  • 847. Shortest Path Visiting All Nodes - 08 May 2019
  • 85. Maximal Rectangle - 05 March 2019
  • 850. Rectangle Area II - 08 May 2019
  • 852. Peak Index in a Mountain Array - 08 May 2019
  • 856. Score of Parentheses - 08 May 2019
  • 86. Partition List - 07 November 2018
  • 864. Shortest Path to Get All Keys - 08 May 2019
  • 872. Leaf-Similar Trees - 08 May 2019
  • 875. Koko Eating Bananas - 08 May 2019
  • 88. Merge Sorted Array - 07 November 2018
  • 886. Possible Bipartition - 08 May 2019
  • 89. Gray Code - 13 November 2018
  • 9. Palindrome Number - 07 November 2018
  • 90. Subsets II - 13 November 2018
  • 901. Online Stock Span - 08 March 2019
  • 904. Fruit Into Baskets - 08 May 2019
  • 907. Sum of Subarray Minimums - 08 March 2019
  • 91. Decode Ways - 13 November 2018
  • 92. Reverse Linked List II - 13 November 2018
  • 923. 3Sum With Multiplicity - 08 May 2019
  • 924. Minimize Malware Spread - 08 May 2019
  • 929. Unique Email Addresses - 08 May 2019
  • 93. Restore IP Addresses - 19 March 2019
  • 931. Minimum Falling Path Sum - 23 March 2019
  • 933. Number of Recent Calls - 08 May 2019
  • 934. Shortest Bridge - 19 March 2019
  • 935. Knight Dialer - 23 March 2019
  • 937. Reorder Log Files - 08 May 2019
  • 939. Minimum Area Rectangle - 08 May 2019
  • 94. Binary Tree Inorder Traversal - 13 November 2018
  • 943. Find the Shortest Superstring - 11 March 2019
  • 947. Most Stones Removed with Same Row or Column - 08 May 2019
  • 95. Unique Binary Search Trees II - 13 November 2018
  • 952. Largest Component Size by Common Factor - 08 May 2019
  • 957. Prison Cells After N Days - 08 May 2019
  • 959. Regions Cut By Slashes - 08 May 2019
  • 96. Unique Binary Search Trees - 14 November 2018
  • 965. Univalued Binary Tree - 08 May 2019
  • 968. Binary Tree Cameras - 08 May 2019
  • 97. Interleaving String - 05 March 2019
  • 973. K Closest Points to Origin - 08 May 2019
  • 975. Odd Even Jump - 08 May 2019
  • 977. Squares of a Sorted Array - 08 May 2019
  • 979. Distribute Coins in Binary Tree - 08 May 2019
  • 98. Validate Binary Search Tree - 14 November 2018
  • 980. Unique Paths III - 23 March 2019
  • 981. Time Based Key-Value Store - 08 May 2019
  • 986. Interval List Intersections - 08 May 2019
  • 987. Vertical Order Traversal of a Binary Tree - 08 May 2019
  • 990. Satisfiability of Equality Equations - 08 May 2019
  • 996. Number of Squareful Arrays - 23 March 2019