LeetCode 0442 - Find All Duplicates in an Array

Parent index: LeetCode 500 Problem Index MOC

Problem Metadata

• LeetCode URL: https://leetcode.com/problems/find-all-duplicates-in-an-array/
• Frontend ID: 442
• Difficulty: Medium
• Primary category: Hashing
• Source lists: NeetCode Practice, Sean Prashad LeetCode Patterns

Related Algorithms

• Hashing
• Hash Table

Research Status

• Problem statement and constraints verified against the LeetCode page.
• Core algorithm explained in paper-style prose.
• Worked examples, edge cases, complexity proof, and pitfalls added.
• Solution variants linked back to the relevant algorithm notes.

See Also

• LeetCode 500 Problem Index MOC
• SWE Interview Preparation MOC