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Solution: Combinations

Explore how to implement a backtracking algorithm that generates all possible combinations of k numbers chosen from the range 1 to n. Understand the recursive approach to building combinations step-by-step, pruning to avoid redundant work, and managing complexity. This lesson equips you with a method to solve combination problems effectively by using recursion and backtracking.

Statement

You are given two integers, n and k. Your task is to return all possible combinations of k numbers chosen from the range [1, n].

The result can be returned in any order.

Note: Combinations are unordered, i.e., [1, 2] and [2, 1] are considered the same combination.

Constraints:

  • 11 \leq n 20\leq 20 ...