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# [216. Combination Sum III](https://leetcode.com/problems/combination-sum-iii/)
## 题目
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.
**Note:**
- All numbers will be positive integers.
- The solution set must not contain duplicate combinations.
**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]]
## 题目大意
找出所有相加之和为 n 的 k 个数的组合。组合中只允许含有 1 - 9 的正整数,并且每种组合中不存在重复的数字。
说明:
- 所有数字都是正整数。
- 解集不能包含重复的组合。
## 解题思路
- 这一题比第 39 题还要简单一些,在第 39 题上稍加改动就可以解出这一道题。
- 第 39 题是给出数组,这一道题数组是固定死的 [1,2,3,4,5,6,7,8,9],并且数字不能重复使用。