Code Room
CodingMedium
Question
Given a string of digits, return every valid IPv4 address that can be formed by inserting three dots, splitting it into four parts. Each part is 0-255 with no leading zeros (except the single digit '0'). Return the addresses sorted lexicographically. Input length is at most 12.
Implement
restore_ip_addresses(s: str) → list[str]Examples
in
["25525511135"]out["255.255.11.135","255.255.111.35"]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.