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| 1 | - | 341 Flatten Nested List |
| 1 | + | ### 341 Flatten Nested List |
| 2 | 377 Combination Sum IV | |
| 3 | 398 Random Pick Index | |
| 4 | 404 Sum of Left Leaves | |
| 5 | 1 Two Sum 23.0% Easy | |
| 6 | - | 10 Regular Expression Matching 22.0% Hard |
| 6 | + | ### 10 Regular Expression Matching 22.0% Hard |
| 7 | 13 Roman to Integer 39.2% Easy | |
| 8 | 15 3Sum 18.8% Medium | |
| 9 | 17 Letter Combinations of a Phone Number 28.6% Medium | |
| 10 | 20 Valid Parentheses 29.3% Easy | |
| 11 | - | 23 Merge k Sorted Lists 23.3% Hard |
| 11 | + | ### 23 Merge k Sorted Lists 23.3% Hard |
| 12 | 25 Reverse Nodes in k-Group 27.5% Hard | |
| 13 | 26 Remove Duplicates from Sorted Array 33.4% Easy | |
| 14 | 28 Implement strStr() 24.8% Easy pi(n,0) | |
| 15 | - | 33 Search in Rotated Sorted Array 30.2% Hard f(a[0] - a[i] < 0) |
| 15 | + | ### 33 Search in Rotated Sorted Array 30.2% Hard f(a[0] - a[i] < 0) |
| 16 | 38 Count and Say 28.9% Easy | |
| 17 | 43 Multiply Strings 23.4% Medium | |
| 18 | 44 Wildcard Matching 17.4% Hard leetcode for #10 | |
| 19 | 49 Group Anagrams 27.4% Medium count sort | |
| 20 | 50 Pow(x, n) 27.9% Medium | |
| 21 | - | 56 Merge Intervals 25.3% Hard |
| 21 | + | ### 56 Merge Intervals 25.3% Hard |
| 22 | 57 Insert Interval 23.8% Hard | |
| 23 | 67 Add Binary 27.4% Easy | |
| 24 | 69 Sqrt(x) 25.2% Medium | |
| 25 | 71 Simplify Path 21.9% Medium | |
| 26 | 75 Sort Colors 34.7% Medium part qsort | |
| 27 | 76 Minimum Window Substring 21.2% Hard | |
| 28 | 78 Subsets 31.3% Medium | |
| 29 | 79 Word Search 22.9% Medium = #, rec, = temp | |
| 30 | 80 Remove Duplicates from Sorted Array II 32.7% Medium | |
| 31 | 85 Maximal Rectangle 23.4% Hard | |
| 32 | 88 Merge Sorted Array 30.0% Easy | |
| 33 | 90 Subsets II 30.5% Medium | |
| 34 | 91 Decode Ways 17.5% Medium | |
| 35 | 98 Validate Binary Search Tree 20.9% Medium | |
| 36 | 102 Binary Tree Level Order Traversal 32.7% Easy | |
| 37 | 117 Populating Next Right Pointers in Each Node II 32.8% Hard | |
| 38 | 121 Best Time to Buy and Sell Stock 36.0% Easy | |
| 39 | 125 Valid Palindrome 23.8% Easy | |
| 40 | 127 Word Ladder 19.6% Medium | |
| 41 | 128 Longest Consecutive Sequence 32.1% Hard | |
| 42 | 133 Clone Graph 24.9% Medium | |
| 43 | 139 Word Break 25.2% Medium | |
| 44 | 146 LRU Cache 15.8% Hard | |
| 45 | 157 Read N Characters Given Read4 29.5% Easy | |
| 46 | 158 Read N Characters Given Read4 II – Call multiple times 23.4% Hard | |
| 47 | 161 One Edit Distance 28.4% Medium | |
| 48 | 168 Excel Sheet Column Title 21.6% Easy --n; | |
| 49 | 173 Binary Search Tree Iterator 34.5% Medium | |
| 50 | 200 Number of Islands 27.6% Medium | |
| 51 | 206 Reverse Linked List 39.4% Easy | |
| 52 | 208 Implement Trie (Prefix Tree) 25.3% Medium | |
| 53 | 209 Minimum Size Subarray Sum 26.8% Medium | |
| 54 | 210 Course Schedule II 21.0% Medium | |
| 55 | 211 Add and Search Word – Data structure design 20.2% Medium | |
| 56 | 215 Kth Largest Element in an Array 33.1% Medium | |
| 57 | 218 The Skyline Problem 22.0% Hard | |
| 58 | 221 Maximal Square 23.5% Medium | |
| 59 | 234 Palindrome Linked List 28.0% Easy | |
| 60 | 235 Lowest Common Ancestor of a Binary Search Tree 37.7% Easy | |
| 61 | 236 Lowest Common Ancestor of a Binary Tree 28.8% Medium | |
| 62 | 238 Product of Array Except Self 42.6% Medium | |
| 63 | 252 Meeting Rooms 41.6% Easy | |
| 64 | 253 Meeting Rooms II 34.6% Medium | |
| 65 | 257 Binary Tree Paths 28.4% Easy | |
| 66 | 261 Graph Valid Tree 32.5% Medium | |
| 67 | 265 Paint House II 35.6% Hard | |
| 68 | 269 Alien Dictionary 22.9% Hard | |
| 69 | 273 Integer to English Words 18.7% Hard | |
| 70 | 274 H-Index 29.3% Medium | |
| 71 | 275 H-Index II 32.5% Medium | |
| 72 | 277 Find the Celebrity 35.1% Medium | |
| 73 | 278 First Bad Version 22.4% Easy | |
| 74 | 282 Expression Add Operators 24.8% Hard | |
| 75 | 283 Move Zeroes 44.0% Easy | |
| 76 | 285 Inorder Successor in BST 35.6% Medium | |
| 77 | 286 Walls and Gates 37.2% Medium | |
| 78 | 297 Serialize and Deserialize Binary Tree 27.8% Hard | |
| 79 | 301 Remove Invalid Parentheses 31.9% Hard | |
| 80 | 311 Sparse Matrix Multiplication 47.2% Medium | |
| 81 | 314 Binary Tree Vertical Order Traversal 30.3% Medium | |
| 82 | 325 Maximum Size Subarray Sum Equals k 39.9% Easy | |
| 83 | 334 Increasing Triplet Subsequence 33.2% Medium |
