CodingHardcod-g037

Subject Interval dpLevel Senior–Staff~25 minCommon in Algorithms & data structures interviewsIndustries Software development

Question

Given a string s, in one operation you may insert any single character at any position. Return the minimum number of insertions required to turn s into a palindrome. The string consists of lowercase English letters and has length between 1 and 500.

Implement

min_insertions_palindrome(s: str) → int

Examples

in["zzazz"]out0

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.