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Solution: Combinations

Explore the backtracking technique to solve combination problems by generating all possible sets of k numbers from a range of 1 to n. Understand how recursive exploration with pruning helps efficiently produce valid combinations, preparing you to tackle similar coding interview questions with confidence.

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 ...