The following questions does not appear in NineChap, but they all worth reading.

Question List

1. Longest Substring Without Repeating Characters

2. Minimum Window Substring - very difficult

3. Scramble String

4. Recover Binary Search Tree

5. Median of Two Sorted Arrays - difficult

6. Sudoku Solver - difficult

7. Word Search

8. Simplify Path

9. Regular Expression Matching - very difficult

10. Wildcard Matching - difficult