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Given an undirected graph with V vertices and E edges, check whether it contains any cycle or not.
Example 1:
Input:Output: 1 Explanation: 1->2->3->4->1 is a cycle.
Example 2:
Input:Output: 0 Explanation: No cycle in the graph.
Your Task:
You don't need to read or print anything. Your task is to complete the function isCycle() which takes V denoting the number of vertices and adjacency list as input parameters and returns a boolean value denoting if the undirected graph contains any cycle or not.
Expected Time Complexity: O(V + E)
Expected Space Complexity: O(V)
Constraints:
1 ≤ V, E ≤ 105
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Yes