| 121. Best Time to Buy and Sell Stock | Solution | Solve | Easy | | |
| 125. Valid Palindrome | Solution | Solve | Easy | | |
| 128. Longest Consecutive Sequence | Solution | Solve | Medium | | |
| 135. Candy | Solution | Solve | Hard | | |
| 138. Copy List with Random Pointer | Solution | Solve | Medium | | |
| 139. Word Break | Solution | Solve | Medium | | |
| 146. LRU Cache | Solution | Solve | Medium | | |
| 152. Maximum Product Subarray | Solution | Solve | Medium | | |
| 153. Find Minimum in Rotated Sorted Array | Solution | Solve | Medium | | |
| 155. Min Stack | Solution | Solve | Medium | | |
| 162. Find Peak Element | Solution | Solve | Medium | | |
| 189. Rotate Array | Solution | Solve | Medium | | |
| 197. Rising Temperature | Solution | Solve | Easy | | |
| 198. House Robber | Solution | Solve | Medium | | |
| 199. Binary Tree Right Side View | Solution | Solve | Medium | | |
| 200. Number of Islands | Solution | Solve | Medium | | |
| 207. Course Schedule | Solution | Solve | Medium | | |
| 210. Course Schedule II | Solution | Solve | Medium | | |
| 215. Kth Largest Element in an Array | Solution | Solve | Medium | | |
| 224. Basic Calculator | Solution | Solve | Hard | | |
| 227. Basic Calculator II | Solution | Solve | Medium | | |
| 238. Product of Array Except Self | Solution | Solve | Medium | | |
| 239. Sliding Window Maximum | Solution | Solve | Hard | | |
| 253. Meeting Rooms II | Solution | Solve | Medium | | |
| 279. Perfect Squares | Solution | Solve | Medium | | |
| 283. Move Zeroes | Solution | Solve | Easy | | |
| 287. Find the Duplicate Number | Solution | Solve | Medium | | |
| 295. Find Median from Data Stream | Solution | Solve | Hard | | |
| 300. Longest Increasing Subsequence | Solution | Solve | Medium | | |
| 305. Number of Islands II | Solution | Solve | Hard | | |
| 322. Coin Change | Solution | Solve | Medium | | |
| 332. Reconstruct Itinerary | Solution | Solve | Hard | | |
| 341. Flatten Nested List Iterator | Solution | Solve | Medium | | |
| 347. Top K Frequent Elements | Solution | Solve | Medium | | |
| 362. Design Hit Counter | Solution | Solve | Medium | | |
| 373. Find K Pairs with Smallest Sums | Solution | Solve | Medium | | |
| 387. First Unique Character in a String | Solution | Solve | Easy | | |
| 394. Decode String | Solution | Solve | Medium | | |
| 395. Longest Substring with At Least K Repeating Characters | Solution | Solve | Medium | | |
| 402. Remove K Digits | Solution | Solve | Medium | | |
| 407. Trapping Rain Water II | Solution | Solve | Hard | | |
| 438. Find All Anagrams in a String | Solution | Solve | Medium | | |
| 442. Find All Duplicates in an Array | Solution | Solve | Medium | | |
| 451. Sort Characters By Frequency | Solution | Solve | Medium | | |
| 460. LFU Cache | Solution | Solve | Hard | | |
| 490. The Maze | Solution | Solve | Medium | | |
| 498. Diagonal Traverse | Solution | Solve | Medium | | |
| 525. Contiguous Array | Solution | Solve | Medium | | |
| 543. Diameter of Binary Tree | Solution | Solve | Easy | | |
| 556. Next Greater Element III | Solution | Solve | Medium | | |
