Some problems were challenging so I googled not only theory but also solutions approaches to solve them.
| № | Title | Solution | Difficulty |
|---|---|---|---|
| 136. | Single Number | Python | Easy |
| 202. | Happy Number | Python | Easy |
| 53. | Maximum Subarray | Python | Easy |
| 283. | Move Zeroes | Python | Easy |
| 122. | Best Time to Buy and Sell Stock II | Python | Easy |
| 49. | Group Anagrams | Python | Medium |
| 1426. | Counting Elements | Python | Easy |
| № | Title | Solution | Difficulty |
|---|---|---|---|
| 876. | Middle of the Linked List | Python | Easy |
| 844. | Backspace String Compare | Python | Easy |
| 155. | Min Stack | Python | Easy |
| 543. | Diameter of Binary Tree | Python | Easy |
| 1046. | Last Stone Weight | Python | Easy |
| 525. | Contiguous Array | Python | Medium |
| 1427. | Perform String Shifts | Python | Easy |
| № | Title | Solution | Difficulty |
|---|---|---|---|
| 238. | Product of Array Except Self | Python | Medium |
| 678. | Valid Parenthesis String | Python | Medium |
| 200. | Number of Islands | Python | Medium |
| 64. | Minimum Path Sum | Python | Medium |
| 33. | Search in Rotated Sorted Array | Python | Medium |
| 1008. | Construct Binary Search Tree from Preorder Traversal | Medium | |
| 1428. | Leftmost Column with at Least a One | Python | Medium |
| № | Title | Solution | Difficulty |
|---|---|---|---|
| 560. | Subarray Sum Equals K | Python | Medium |
| 201. | Bitwise AND of Numbers Range | Python | Medium |
| 146. | LRU Cache | Python | Medium |
| 55. | Jump Game | Python | Medium |
| 1143. | Longest Common Subsequence | Python | Medium |
| 221. | Maximal Square | Python | Medium |
| 1429. | First Unique Number | Python | Medium |
| № | Title | Solution | Difficulty |
|---|---|---|---|
| 124. | Binary Tree Maximum Path Sum | Python | Hard |
| 1430. | Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree | Python | Medium |