|  | 1. Two Sum |  |  | Solve | Easy |  |  | 
|  | 3. Longest Substring Without Repeating Characters |  |  | Solve | Medium |  |  | 
|  | 4. Median of Two Sorted Arrays |  |  | Solve | Hard |  |  | 
|  | 5. Longest Palindromic Substring |  |  | Solve | Medium |  |  | 
|  | 8. String to Integer (atoi) |  |  | Solve | Medium |  |  | 
|  | 11. Container With Most Water |  |  | Solve | Medium |  |  | 
|  | 15. 3Sum |  |  | Solve | Medium |  |  | 
|  | 16. 3Sum Closest |  |  | Solve | Medium |  |  | 
|  | 17. Letter Combinations of a Phone Number |  |  | Solve | Medium |  |  | 
|  | 20. Valid Parentheses |  |  | Solve | Easy |  |  | 
|  | 31. Next Permutation |  |  | Solve | Medium |  |  | 
|  | 33. Search in Rotated Sorted Array |  |  | Solve | Medium |  |  | 
|  | 34. Find First and Last Position of Element in Sorted Array |  |  | Solve | Medium |  |  | 
|  | 42. Trapping Rain Water |  |  | Solve | Hard |  |  | 
|  | 46. Permutations |  |  | Solve | Medium |  |  | 
|  | 49. Group Anagrams |  |  | Solve | Medium |  |  | 
|  | 50. Pow(x, n) |  |  | Solve | Medium |  |  | 
|  | 53. Maximum Subarray |  |  | Solve | Medium |  |  | 
|  | 62. Unique Paths |  |  | Solve | Medium |  |  | 
|  | 64. Minimum Path Sum |  |  | Solve | Medium |  |  | 
|  | 70. Climbing Stairs |  |  | Solve | Easy |  |  | 
|  | 74. Search a 2D Matrix |  |  | Solve | Medium |  |  | 
|  | 91. Decode Ways |  |  | Solve | Medium |  |  | 
|  | 94. Binary Tree Inorder Traversal |  |  | Solve | Easy |  |  | 
|  | 111. Minimum Depth of Binary Tree |  |  | Solve | Easy |  |  | 
|  | 118. Pascal's Triangle |  |  | Solve | Easy |  |  | 
|  | 119. Pascal's Triangle II |  |  | Solve | Easy |  |  | 
|  | 121. Best Time to Buy and Sell Stock |  |  | Solve | Easy |  |  | 
|  | 135. Candy |  |  | Solve | Hard |  |  | 
|  | 137. Single Number II |  |  | Solve | Medium |  |  | 
|  | 138. Copy List with Random Pointer |  |  | Solve | Medium |  |  | 
|  | 141. Linked List Cycle |  |  | Solve | Easy | 42gearMobilitySystems+131 |  | 
|  | 146. LRU Cache |  |  | Solve | Medium |  |  | 
|  | 153. Find Minimum in Rotated Sorted Array |  |  | Solve | Medium |  |  | 
|  | 166. Fraction to Recurring Decimal |  |  | Solve | Medium |  |  | 
|  | 168. Excel Sheet Column Title |  |  | Solve | Easy |  |  | 
|  | 179. Largest Number |  |  | Solve | Medium |  |  | 
|  | 200. Number of Islands |  |  | Solve | Medium |  |  | 
|  | 209. Minimum Size Subarray Sum |  |  | Solve | Medium |  |  | 
|  | 215. Kth Largest Element in an Array |  |  | Solve | Medium |  |  | 
|  | 232. Implement Queue using Stacks |  |  | Solve | Easy |  |  | 
|  | 239. Sliding Window Maximum |  |  | Solve | Hard |  |  | 
|  | 242. Valid Anagram |  |  | Solve | Easy |  |  | 
|  | 275. H-Index II |  |  | Solve | Medium |  |  | 
|  | 287. Find the Duplicate Number |  |  | Solve | Medium |  |  | 
|  | 295. Find Median from Data Stream |  |  | Solve | Hard |  |  | 
|  | 300. Longest Increasing Subsequence |  |  | Solve | Medium |  |  | 
|  | 322. Coin Change |  |  | Solve | Medium |  |  | 
|  | 387. First Unique Character in a String |  |  | Solve | Easy |  |  | 
|  | 390. Elimination Game |  |  | Solve | Medium |  |  |