77. Combinations

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

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