Hshs

//formarea matricii de incidenta

#include <iostream>

#include <fstream>

using namespace std;

int n,m,a[100][100],i,j,x,y;

ifstream f("date.in");

int main()

{

    f>>n>>m;

    for(i=1;i<=m;i++)

        {f>>x>>y;

         a[x][i]=-1;

         a[y][i]=1;

        }

    for(i=1;i<=n;i++)

        {for(j=1;j<=m;j++)

            cout<<a[i][j]<<' ';

        cout<<endl;}

    return 0;

}