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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 out of the range_ `[1, n]`.

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

**Example 1:**

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

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

**Example 2:**

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

**Output:** \[\[1\]\] 

**Constraints:**

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