Web Reference: In-depth solution and explanation for LeetCode 77. Combinations in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. 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. When adding the current combination to the result list, you must create a copy. Otherwise, subsequent modifications during backtracking will alter the already-added result.
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