Sorted:

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)

CodeSignal Interview – isCryptSolution

CodeSignal Interview – sudoku2

CodeSignal Interview – firstNotRepeatingCharacter

CodeSignal Interview – firstDuplicate