Generate combinations and permutations
Company: Bytedance
Role: Site Reliability Engineer
Category: Coding & Algorithms
Difficulty: medium
Interview Round: Technical Screen
Given two integers n and k, where 1 <= k <= n, write code for two related tasks using the numbers 1 through n:
1. Generate all unique combinations of size k.
2. Generate all unique ordered arrangements of length k using distinct numbers.
A number may not be reused within the same result, and the output must not contain duplicate sequences. Explain the approach and analyze the time and space complexity.
Quick Answer: This question evaluates a candidate's ability to implement combinatorial generation of combinations and permutations using distinct elements, testing understanding of combinatorics, search-space enumeration, and uniqueness constraints within the Coding & Algorithms domain.