{ "data": { "question": { "questionId": "216", "questionFrontendId": "216", "boundTopicId": null, "title": "Combination Sum III", "titleSlug": "combination-sum-iii", "content": "

Find all valid combinations of k numbers that sum up to n such that the following conditions are true:

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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.

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Example 1:

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\nInput: k = 3, n = 7\nOutput: [[1,2,4]]\nExplanation:\n1 + 2 + 4 = 7\nThere are no other valid combinations.
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Example 2:

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\nInput: k = 3, n = 9\nOutput: [[1,2,6],[1,3,5],[2,3,4]]\nExplanation:\n1 + 2 + 6 = 9\n1 + 3 + 5 = 9\n2 + 3 + 4 = 9\nThere are no other valid combinations.\n
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Example 3:

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\nInput: k = 4, n = 1\nOutput: []\nExplanation: There are no valid combinations.\nUsing 4 different numbers in the range [1,9], the smallest sum we can get is 1+2+3+4 = 10 and since 10 > 1, there are no valid combination.\n
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Constraints:

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