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#include <iostream>
#include <vector>
#include <stack>
using namespace std;
struct node
{
    int in;
    vector<int>out;
};
int main()
{
    int t;
    cin>>t;
    while(t!=0)
    {
        int n,m;
        cin>>n>>m;
        vector<node>gouph;
        for(int i=0;i<n;i++)
        {
            node a;
            a.in=0;
            gouph.push_back(a);
        }
        for(int i=0;i<m;i++)
        {
            int a,b;
            cin>>a>>b;
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