Backtracking
10 Regular Expression Matching17 Letter Combinations of a Phone Number22 Generate Parentheses37 Sudoku Solver39 Combination Sum40 Combination Sum II44 Wildcard Matching46 Permutations47 Permutations II51 N-Queens52 N-Queens II60 Permutation Sequence77 Combinations78 Subsets79 Word Search89 Gray Code90 Subsets II93 Restore IP Addresses131 Palindrome Partitioning212 Word Search II216 Combination Sum III254 Factor Combinations267 Palindrome Permutation II291 Word Pattern II320 Generalized Abbreviation351 Android Unlock Patterns357 Count Numbers with Unique Digits401 Binary Watch411 Minimum Unique Word Abbreviation425 Word Squares473 Matchsticks to Square491 Increasing Subsequences526 Beautiful Arrangement679 24 Game691 Stickers to Spell Word797 All Paths From Source to Target
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