Backtracking
Explore choices depth first, undo them, and prune dead ends.
- 127.78. Subsets
- 128.39. Combination Sum
- 129.40. Combination Sum II
- 130.46. Permutations
- 131.90. Subsets II
- 132.79. Word Search
- 133.131. Palindrome Partitioning
- 134.17. Letter Combinations of a Phone Number
- 135.51. N-Queens
- 136.1863. Sum of All Subset XOR Totals
- 137.77. Combinations
- 138.47. Permutations II
- 139.698. Partition to K Equal Sum Subsets
- 140.473. Matchsticks to Square
- 141.52. N-Queens II
- 142.140. Word Break II