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38 lines
1.0 KiB
Markdown
Executable File
38 lines
1.0 KiB
Markdown
Executable File
# [216. Combination Sum III](https://leetcode.com/problems/combination-sum-iii/)
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## 题目
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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.
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**Note:**
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- All numbers will be positive integers.
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- The solution set must not contain duplicate combinations.
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**Example 1:**
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Input: k = 3, n = 7
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Output: [[1,2,4]]
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**Example 2:**
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Input: k = 3, n = 9
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Output: [[1,2,6], [1,3,5], [2,3,4]]
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## 题目大意
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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。
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说明：
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- 所有数字都是正整数。
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- 解集不能包含重复的组合。
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## 解题思路
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- 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。
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- 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。
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