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g0001_0100.s0077_combinations.readme.md Maven / Gradle / Ivy

77\. Combinations

Medium

Given two integers `n` and `k`, return _all possible combinations of_ `k` _numbers chosen from the range_ `[1, n]`.

You may return the answer in **any order**.

**Example 1:**

**Input:** n = 4, k = 2

**Output:** [[1,2],[1,3],[1,4],[2,3],[2,4],[3,4]]

**Explanation:** There are 4 choose 2 = 6 total combinations. Note that combinations are unordered, i.e., [1,2] and [2,1] are considered to be the same combination.

**Example 2:**

**Input:** n = 1, k = 1

**Output:** [[1]]

**Explanation:** There is 1 choose 1 = 1 total combination.

**Constraints:**

*   `1 <= n <= 20`
*   `1 <= k <= n`