Backtracking
17. Letter Combinations of a Phone Number26. Generate Parentheses37. Sudoku Solver39. Combination Sum40. Combination Sum II46. Permutations47. Permutations II77. Combinations93. Restore IP Addresses140. Word Break II216. Combination Sum III241. Different Ways to Add Parentheses248. Strobogrammatic Number III254. Factor Combinations267. Palindrome Permutation II282. Expression Add Operators294. Flip Game II320. Generalized Abbreviation351. Android Unlock Patterns491. Increasing Subsequences679. 24 Game698. Partition to K Equal Sum Subsets756. Pyramid Transition Matrix784. Letter Case Permutation980. Unique Paths III1087. Brace Expansion1219. Path with Maximum Gold1258. Synonymous Sentences
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