Mind palace

06-10

39. Combination Sum

06-10

38. Count and Say

06-10

37. Sudoku Solver

06-01

36. Valid Sudoku

06-01

35. Search Insert Position

06-01

34. Find First and Last Position of Element in Sorted Array

06-01

33. Search in Rotated Sorted Array

06-01

32. Longest Valid Parentheses

05-31

31. Next Permutation

05-31

30. Substring with Concatenation of All Words