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Solution: Detect Cycle in a Directed Graph

Understand how to detect cycles in directed graphs by implementing a depth-first search algorithm. This lesson guides you through using recursion and tracking visited nodes to accurately identify cycles, enhancing your graph algorithm skills for coding interviews.

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Statement

Given a directed graph, check whether the graph contains a cycle and return a boolean value accordingly.

A cycle occurs when you can start at one vertex, follow a path through the edges, and return to the starting vertex. This means at least one vertex is visited more than once within the same traversal path.

Note: Edges list is interpreted in the following manner:

edges = [[0, 2, 1], [], [2, 1, 0]]

Interpretation:

0:0,2,10: 0, 2, 1 ...