| No. | Problems | My Solution | Related Topic | Date |
|---|---|---|---|---|
| 1 | Two Sum | Solution | Array, Hash Table | _ |
| 2 | Add Two Numbers | Solution | Linked List, Math | |
| 3 | Longest Substring Without Repeating Characters | Solution | Hash Table, Two Pointers, String, Sliding Window | |
| 4 | Median of Two Sorted Arrays | Solution | Array, Binary Search, Divide and Conquer | |
| 6 | ZigZag Conversion | Solution | String | |
| 7 | Reverse Integer | Solution | Math | |
| 9 | Palindrome Number | Solution | Math | |
| 10 | Regular Expression Matching | Solution | String, Dynamic Programming, Backtracking | |
| 11 | Container With Most Water | Solution | Array, Two Pointers | |
| 12 | Integer to Roman | Solution | Math, String | |
| 13 | Roman to Integer | Solution | Math, String | |
| 14 | Longest Common Prefix | Solution | String | |
| 15 | 3Sum | Solution | Array, Two Pointers | |
| 16 | 3Sum Closest | Solution | Array, Two Pointers | |
| 18 | 4Sum | Solution | ||
| 19 | Remove Nth Node From End of List | Solution | ||
| 20 | Valid Parentheses | Solution | ||
| 21 | Merge Two Sorted Lists | Solution | ||
| 24 | Swap Nodes in Pairs | Solution | ||
| 26 | Remove Duplicates from Sorted Array | Solution | ||
| 27 | Remove Element | Solution | ||
| 28 | Implement strStr() | Solution | ||
| 29 | Divide Two Integers | Solution | ||
| 31 | Next Permutation | Solution | ||
| 33 | Search in Rotated Sorted Array | Solution | Array, Binary Search | 7th April'20 |
| 34 | Find First and Last Position of Element in Sorted Array | Solution | Array, Binary Search | 7th April'20 |
| 35 | Search Insert Position | Solution | Array, Binary Search | 7th April'20 |
| 36 | Valid Sudoku | Solution | Hash Table | 8th April'20 |
| 38 | Count and Say | Solution | String | 9th April'20 |
| 39 | Combination Sum | Solution | Array, Backtracking | 9th April'20 |
| 40 | Combination Sum II | Solution | Array Backtracking | 9th April'20 |
| 43 | Multiply Strings | Solution | Math String | 10th April'20 |
| 46 | Permutations | Solution | Backtracking | 11th April'20 |
| 48 | Rotate Image | Solution | Math | 14th April'20 |
| 49 | Group Anagrams | Solution | Hash Table, String | 22nd April |
| 53 | Maximum Subarray | Solution | Array, Divide and Conquer, Dynamic Programming | 10th April'20 |
| 54 | Spiral Matrix | Solution | Array | 24th April'20 |
| 55 | Jump Game | Solution | Array, Greedy | 24th April'20 |
| 56 | Merge Intervals | Solution | Array, Sort | 24th April'20 |
| 58 | Length of Last Word | Solution | String | 24th April'20 |
| 59 | Spiral Matrix II | Solution | Array | 25th April'20 |
| 61 | Rotate List | Solution | Linked List, Two Pointers | 26th April'20 |
| 62 | Unique Paths | Solution | Array, Dynamic Programming | 26th April'20 |
| 63 | Unique Paths II | Solution | Array, Dynamic Programming | 27th April'20 |
| 64 | Minimum Path Sum | Solution | Array, Dynamic Programming | 27th April'20 |
| 66 | Plus One | Solution | Array | 27th April'20 |
| 67 | Add Binary | Solution | String, Math | 28th April'20 |
| 69 | Sqrt(x) | Solution | Math, Binary Search | 28th April'20 |
| 70 | Climbing Stairs | Solution | Dynamic Programming | 30th April'20 |
| 73 | Set Matrix Zeroes | Solution | Array | 30th April'20 |
| 74 | Search a 2D Matrix | Solution | Array, Binary Search | 30th April'20 |
| 75 | Sort Colors | Solution | Array, Two Pointers, Sort | 2nd May'20 |
| 77 | Combinations | Solution | Backtracking | 5th May'20 |
| 78 | Subsets | Solution | Array, Backtracking, Bit Manipulation | 9th May'20 |
| 80 | Remove Duplicates from Sorted Array II | Solution | Array, Two Pointers | 12th May'20 |
| 81 | Search in Rotated Sorted Array II | Solution | Array, Binary Search | 16th May'20 |
| 83 | Remove Duplicates from Sorted List | Solution | Linked List | 16th May'20 |
| 94 | Binary Tree Inorder Traversal | Solution | Tree | |
| 98 | Validate Binary Search Tree | Solution | Tree, Depth-first Search | 5th April'20 |
| 100 | Same Tree | Solution | Tree, Depth-first Search | 6th April'20 |
| 101 | Symmetric Tree | Solution | Tree, Depth-first Search, Breadth-first Search | 23rd May'20 |
| 102 | Binary Tree Level Order Traversal | Solution | Tree, Breadth-first Search | 25th May'20 |
| 103 | Binary Tree Zigzag Level Order Traversal | Solution | Tree, Stack, Breadth-first Search | 26th May'20 |
| 104 | Maximum Depth of Binary Tree | Solution | Tree, Breadth-first Search | 26th May'20 |
| 107 | Binary Tree Level Order Traversal II | Solution | Tree, Breadth-first Search | 28th May'20 |
| 108 | Convert Sorted Array to Binary Search Tree | Solution | Tree, Depth-first Search | 28th May'20 |
| 114 | Flatten Binary Tree to Linked List | Solution | Tree, Depth-first Search | |
| 125 | Valid Palindrome | Solution | Two Pointers, String | 3rd August'20 |
| 202 | Happy Number | Solution | Hash Table, Math | 30th April'20 |
| 342 | Power of Four | Solution | Bit Manupulation | 4th August'20 |
| 437 | Path Sum III | Solution | Tree | 9th August'20 |
| 520 | Detect Capital | Solution | String | 1st August'20 |
| 705 | Design HashSet | Solution | Hash Table, Design | 2nd August'20 |
| 1450 | Number of Students Doing Homework at a Given Time | Solution | Array | 17th May'20 |
| 1451 | Rearrange Words in a Sentence | Solution | String, Sort | 17th May'20 |
| No. | Problems | My Solution | Related Topic | Date |
|---|---|---|---|---|
| 5 | Longest Palindromic Substring | to be added | ||
| 8 | String to Integer (atoi) | to be added | ||
| 17 | Letter Combinations of a Phone Number | to be added | ||
| 22 | Generate Parentheses | to be added | ||
| 23 | Merge k Sorted Lists | to be added | ||
| 25 | Reverse Nodes in k-Group | to be added | ||
| 30 | Substring with Concatenation of All Words | to be added | ||
| 32 | ||||
| 37 | ||||
| 95 | Unique Binary Search Trees II | to be added | Tree | |
| 41 | ||||
| 42 |