| 1 | Two Sum | Easy |
| 7 | Reverse Integer | Easy |
| 9 | Palindrome Number | Easy |
| 13 | Roman to Integer | Easy |
| 14 | Longest Common Prefix | Easy |
| 20 | Valid Parentheses | Easy |
| 21 | Merge Two Sorted Lists | Easy |
| 26 | Remove Duplicates from Sorted Array | Easy |
| 27 | Remove Element | Easy |
| 28 | Implement strStr() | Easy |
| 35 | Search Insert Position | Easy |
| 38 | Count and Say | Easy |
| 53 | Maximum Subarray | Easy |
| 58 | Length of Last Word | Easy |
| 66 | Plus One | Easy |
| 67 | Add Binary | Easy |
| 69 | Sqrt(x) | Easy |
| 70 | Climbing Stairs | Easy |
| 83 | Remove Duplicates from Sorted List | Easy |
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