216. Combination Sum III

Find all possible combinations ofknumbers that add up to a numbern, given that only numbers from 1 to 9 can be used and each combination should be a unique set of numbers.

Example 1:
Input:k= 3,n= 7 Output: [[1,2,4]]
Example 2:
Input:k= 3,n= 9  Output:  [[1,2,6], [1,3,5], [2,3,4]]

216. Combination Sum III_第1张图片

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