Sorted:

Find the 1500th regular number

Leetcode – 17. Letter Combinations of a Phone Number

Leetcode – 16. 3sum closest (yeah… threesum again)

Leetcode – 15. 3sum (yes, threesum)

Leetcode – 14. Longest common prefix

Leetcode – 13. Roman to Integer

Leetcode – 12. Integer to Roman

Leetcode – 11. Container With Most Water

Leetcode – 9. Palindrome Number (Easy)

Leetcode – 8. String to Integer (atoi)