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. Combinations - 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. To generate all combinations of k numbers from 1 to n, we make a binary choice for each number: include it or exclude it. This forms a decision tree where each path represents a subset.
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