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Detect Cycle in Directed Graph

Problem
Examples
Example 1
Example 2
Example 3
Example 4
Solution
Method 1 - DFS
Algorithm
How Different is Recursion Stack From Visited Array?
Code
Complexity
Method 2 - BFS (Kahn's Algorithm for Topological Sort)
Algorithm
Code
Complexity
Why This Works
Method 3 - Union Find (Not Recommended)

Related Tags

graph/cycle graph/directed

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