Status Title Solution Difficulty Points
1. Two Sum Yes easy 95
2. Add Two Numbers No Medium 0
3. Longest Substring Without Repeating Characters Yes Medium 85
4. Median of Two Sorted Arrays Yes easy 0
5. Longest Palindromic Substring No Medium 15
6. Zigzag Conversion Yes easy 90
7. Reverse Integer Yes hard 67
8. String to Integer (atoi) Yes easy 80
9. Palindrome Number No easy 0
10. Regular Expression Matching Yes Medium 87
11. Valid Parentheses Yes hard 0