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| # | Problem | Difficulty | Category |
|---|---|---|---|
| 1 | Two Sum | easy | arrays |
| 2 | Reverse a String | easy | strings |
| 3 | Valid Parentheses | easy | stacks-queues |
| 4 | Maximum Subarray | medium | dynamic-programming |
| 5 | Merge Two Sorted Lists | easy | linked-lists |
| 6 | Binary Search | easy | searching |
| 7 | Climbing Stairs | easy | dynamic-programming |
| 8 | Number of Islands | medium | graphs |
| 9 | Longest Substring Without Repeating Characters | medium | strings |
| 10 | Invert Binary Tree | easy | trees |
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