CodingMediumcod-g810

Subject KmpLevel Mid–Senior~25 minCommon in Algorithms & data structures interviewsIndustries Software development

Question

Given a lowercase string s, determine whether it can be constructed by taking some proper substring of it and concatenating one or more copies of that substring together. Return true if so. 'abab' is true ('ab' twice); 'aba' is false; 'aaaa' is true. Length up to a few thousand.

Implement

repeated_substring_pattern(s: str) → bool

Examples

in["abab"]outtrue

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.