Web Reference: This problem reinforces recursion and backtracking, and helps build intuition for exploring decision trees and constructing solutions step-by-step. 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: Output: [[1,2],[1,3],[1,4],[2,3],[2,4],[3,4]] Explanation: There are 4 choose 2 = 6 total combinations. We can simulate backtracking iteratively using an array of size k to track our current combination. An index pointer moves forward when we find valid numbers and backward when we need to backtrack.
YouTube Excerpt: Combinations
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