152: Сyclic graph

Given a number of nodes labeled from 0 to nodes - 1 and a list of edges, check does the graph has a cycle

Note: An edge is a pair of nodes

 

Example 1

Input:   nodes = 4, edges = [[0, 1], [2, 3]]

Output:  false

Explanation: 0-->1 2-->3

Example 2

Input:   nodes = 3, edges = [[0, 1], [1, 2], [2, 0]]

Output:  true