| No. | Problem | Difficulty |
|---|---|---|
| 1 | Append Characters to String to Make Subsequence | Medium |
| 2 | Boats to Save People | Medium |
| 3 | Sum-of-square-numbers | Medium |
| 4 | Next-permutation | Medium |
| 5 | Adding-spaces-to-a-string | Medium |
| 6 | Apply-operations-to-an-array | Easy |
| 7 | Minimum-average-of-smallest-and-largest-elements | Easy |
| 8 | Rearrange-array-elements-by-sign | Medium |