202104. The first 100

[ylqi007]

• [x] 1. Two Sum
• [x] 2. Add Two Numbers
• [x] 3. Longest Substring Without Repeating Characters
• [x] 4. Median of Two Sorted Arrays
• [x] 5. Longest Palindromic Substring
• [x] 6. ZigZag Conversion
• [x] 7. Reverse Integer
• [x] 8. String to Integer (atoi)
• [x] 9. Palindrome Number
• [ ] 10. Regular Expression Matching
• [x] 11. Container With Most Water
• [ ] 12. Integer to Roman
• [ ] 13. Roman to Integer
• [x] 14. Longest Common Prefix
• [x] 15. 3Sum
• [x] 16. 3Sum Closest
• [x] 17. Letter Combinations of a Phone Number
• [ ] 18. 4Sum
• [x] 19. Remove Nth Node From End of List
• [x] 20. Valid Parentheses
• [x] 21. Merge Two Sorted Lists
• [x] 22. Generate Parentheses Backtracking
• [x] 23. Merge k Sorted Lists Quick Merge
• [x] 24. Swap Nodes in Pairs Recursion, Iterative
• [x] ⭐ 25. Reverse Nodes in k-Group Recursion, Iterative
• [x] 26. Remove Duplicates from Sorted Array Two Pointers
• [x] 27. Remove Element Two Pointers
• [x] 28. Implement strStr() Two Pointers
• [ ] 29. Divide Two Integers
• [ ] ⭐ 30. Substring with Concatenation of All Words Hash Table; Two Pointers?
• [ ] ⭐ 31. Next Permutation
• [ ] ⭐ 32. Longest Valid Parentheses Dynamic Programming
• [x] ⭐ 33. Search in Rotated Sorted Array Binary Search