Ankit-Pankaj

// { Driver Code Starts
#include<bits/stdc++.h>
using namespace std;
#define watch(x) cout << (#x) << " is " << (x) << "\n"
#define watch2(x,y) cout <<(#x)<<" is "<<(x)<<" and "<<(#y)<<" is "<<(y)<<"\n"

//--------------------------------------------------------------------------------------------------
//                  Detect cycle in Directed Graph
//                  https://www.youtube.com/watch?v=1u2VLzBhJZU
bool res=true;