152. Combination Sum II

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Input: candidates = [10,1,2,7,6,1,5], target = 8

Output: [[1,1,6],[1,2,5],[1,7],[2,6]]

Explanation: The combinations [1,1,6], [1,2,5], [1,7], and [2,6] are the unique sets of numbers from the input array that sum up to 8.

Input: candidates = [2,5,2,1,2], target = 5

Output: [[1,2,2],[5]]

Explanation: The combinations [1,2,2] and [5] are the unique sets of numbers from the input array that sum up to 5.

Time Complexity

O(2^n)

Space Complexity

O(n)