33. Search in Rotated Sorted Array LeetCode Solution 32. Longest Valid Parentheses LeetCode Solution 31. Next Permutation LeetCode Solution 30. Substring with Concatenation of All Words LeetCode Solution 29. Divide Two Integers LeetCode Solution 28. Find the Index of the First Occurrence in a String LeetCode Solution 27. Remove Element LeetCode Solution 26. Remove Duplicates from Sorted Array LeetCode Solution 25. Reverse Nodes in k-Group LeetCode Solution 24. Swap Nodes in Pairs LeetCode Solution 23. Merge k Sorted Lists LeetCode Solution 22. Generate Parentheses LeetCode Solution 21. Merge Two Sorted Lists LeetCode Solution 20. Valid Parentheses LeetCode Solution 19. Remove Nth Node From End of List LeetCode Solution 18. 4Sum LeetCode Solution 17. Letter Combinations of a Phone Number LeetCode Solution 16. 3Sum Closest LeetCode Solution 15. 3Sum LeetCode Solution 14. Longest Common Prefix LeetCode Solution 13. Roman to Integer LeetCode Solution 12. Integer to Roman LeetCode Solution 11. Container With Most Water LeetCode Solution 10. Regular Expression Matching LeetCode Solution 9. Palindrome Number LeetCode Solution 8. String to Integer (atoi) LeetCode Solution 7. Reverse Integer LeetCode Solution 6. Zigzag Conversion LeetCode Solution 5. Longest Palindromic Substring LeetCode Solution 4. Median of Two Sorted Arrays LeetCode Solution