216. Combination Sum III

LeetCodeArrayBacktrackingOpen on judge ↗

Find all valid combinations of k numbers that sum up to n such that the following conditions are true: - Only numbers 1 through 9 are used. - Each number is used at most once. Return a list of all possible valid combinations. The list must not contain the same combination twice, and the combinations may be returned in any order. Example 1: Input: k = 3, n = 7 Output: [[1,2,4]] Explanation:

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solution.cppC++17

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