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Detect Cycle in Undirected Graph

Last edited: August 9, 2025

Problem
Examples
Example 1
Example 2
Example 3
Example 4
Solution
Method 1 - DFS and Parent
Algorithm
Code
Complexity
Method 2 - BFS and Parent Tracking
Algorithm
Code
Complexity
Method 3 - Union Find (Disjoint Set)
Algorithm
Example Walkthrough
Code
Complexity
Key Optimizations

Related Tags

daily-coding-problem graph depth-first-search breadth-first-search graph/undirected union-find

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