CodingEasycod-p070

Subject Arrays stringsLevel Entry–Mid~15 minCommon in Algorithms & data structures interviewsIndustries Software development

Question

An array of length n holds values in 1..n with some missing (and some duplicated). Return all values in 1..n that do not appear.

Implement

find_disappeared(nums: list[int]) → list[int]

Examples

in[[4,3,2,7,8,2,3,1]]out[5,6]

What a strong answer looks like

State your approach and its time/space complexity out loud before you optimize. Handle the edge cases (empty input, duplicates, overflow), and say why you chose this over the brute force. Green tests are the floor, not the grade.

Learn the concepts

Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.

Run or narrate your approach, then ask the coach.