| Title | Solution | Difficulty |
|---|---|---|
| 1. Two Sum | - | Easy |
| 70. Climbing Stairs | - | Easy |
| 104. Maximum Depth of Binary Tree | - | Easy |
| 121. Best Time to Buy and Sell Stock | - | Easy |
| 191. Number of 1 Bits | - | Easy |
| 206. Reverse Linked List | - | Easy |
| 322. Coin Change | 💬 | Medium |
| 371. Sum of Two Integers | - | Medium |
