Generate Parentheses

Word Search

Letter Case Permutation

Subsets

Subsets II

Permutations

Permutations II

Beautiful Arrangement

Generalized Abbreviation

Combinations

Combination Sum

Combination Sum II

Combination Sum III

Letter Combinations of a Phone Number

Palindrome Partitioning

Path Sum II

Path Sum III

Partition to K Equal Sum Subsets

Word Search II

N-Queens

Restore IP Addresses

Word Break II

All Paths From Source to Target

Path with Maximum Gold

Matchsticks to Square

Sum Root to Leaf Numbers

Sudoku Solver

Reconstruct Itinerary