Backtrack 基本題型

  1. Permutaions 46. Permutations, 47. Permutations II
  2. Subsets 78. Subsets, 90. Subsets II
  3. Combinations 77. Combinations, 39. Combination Sum, 40. Combination Sum II, 216. Combination Sum III

練習

  1. Word break 139. Word Break