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花花酱 LeetCode 216. Combination Sum III

题目大意:输出所有用k个数的和为n的组合。可以使用的元素是1到9。

Problem:

Find all possible combinations of k numbers that add up to a number n, 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:

Example 2:

Input: k = 3, n = 9

Output:

 



Idea:

DFS + backtracking

bit

Solution:

C++

 

C++ / binary

 

Python

 

 

Related problems:

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