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Grokking the Coding Interview Patterns

Solution: Combinations

Explore how to solve combination problems via backtracking by building candidate sequences step-by-step. Understand pruning techniques to efficiently find all unique combinations of k numbers chosen from 1 to n. This lesson helps develop a systematic way to approach similar algorithmic challenges.

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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:

  • 1≤1 \leq n ≤20\leq 20

  • 1≤1 \leq k ≤n\leq n ...