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Backtracking

12 problems. Tick each as you solve it.

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• medium Combination Sum
• medium Combination Sum II
• medium Combination Sum III
• medium Combinations
• medium Letter Combinations of a Phone Number
• medium Palindrome Partitioning
• medium Permutations
• medium Subsets
• medium Subsets II
• medium Word Search
• hard N-Queens
• hard N-Queens II