Longest Cycle in a Graph

Statement

You are given a directed graph with n nodes, labeled from 0 to n - 1. Each node in the graph has at most one outgoing edge.

The graph is described using a 0-indexed integer array edges of length n, where:

• edges[i] represents a directed edge from node i to node edges[i].

• If node i has no outgoing edge, then edges[i] == -1.

Your task is to find the longest cycle length in the graph. If no cycle exists, return -1.

Note: A cycle is defined as a path that starts and ends at the same node, following the direction of the edges.

Constraints:

• n ...