| # | Title | Solution | Difficulty |
|---|---|---|---|
| 1 | Add Two Numbers | C | Medium |
| 2 | Two Sums | C | Easy |
| 3 | Buy Two Chocolates | C | Easy |
| 4 | Can Place Flowers | C | Easy |
| 5 | Climbing Stairs | C | Easy |
| 6 | Contains Duplicate | C | Easy |
| 7 | Fizz Buzz | C | Easy |
| 8 | Happy Number | C | Easy |
| 9 | Maximum 69 Number | C | Easy |
| 10 | Palindrome Number | C | Easy |
| 11 | Power of Two | C | Easy |
| 12 | Remove Element | C | Easy |
| 13 | Roman to Integer | C | Easy |
| 14 | Single Number | C | Easy |
| 15 | Teemo Attacking | C | Easy |
| 16 | Two Sum | C | Easy |
| 17 | Valid Anagram | C | Easy |
| 18 | sqrt(x) | C | Easy |