2. Pow(x, n) Easy
3. Count Good Numbers Easy
8. Letter Combination of Phone Number Medium
9. Combination Sum Medium
21. Subset 2 Medium
22. Generate Paranthesis Medium
23. Generate all string without consecutive 1's Medium
24. Power Set Medium
25. Subsequence with Sum K Medium
26. Combination Sum II Medium
27. Combination sum iii Medium
28. Palindrome Partitioning Medium
29. Word Search Medium
30. N Queen Hard
31. Rat in a maze Medium
32. M Coloring Medium