1. Two Sum 2. Add Two Numbers 3. Longest Substring Without Repeating Characters 36.8% Med. 4. Median of Two Sorted Arrays 5. Longest Palindromic Substring 6. Zigzag Conversion 7. Reverse Integer 8. String to Integer (atoi) 9. Palindrome Number 10. Regular Expression Matching 11. Container With Most Water 12. Integer to Roman