CodingMediumcod-g109

Subject DequeLevel Mid–Senior~20 minCommon in Algorithms & data structures interviewsIndustries Software development

Question

Given a string s, determine whether it is a palindrome considering only alphanumeric characters and ignoring case and all other characters. Implement the check using a two-ended (front/back) scan as one would with a deque. Return True or False. The string has length 0 to 2*10^5 and may contain any printable ASCII characters.

Implement

is_clean_palindrome(s: str) → bool

Examples

in["A man, a plan, a canal: Panama"]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.