CodingMediumcod-g241

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

Question

Given an undirected graph with n nodes (0..n-1) and edges [u, v], determine whether an Eulerian path exists: a walk that uses every edge exactly once. Return True or False. Isolated nodes (degree 0) are ignored for connectivity; a graph with no edges trivially has one. Constraints: 1 <= n <= 2000; parallel edges allowed.

Implement

has_eulerian_path_undirected(n: int, edges: list[list[int]]) → bool

Examples

in[3,[[0,1],[1,2]]]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.