[C++]Formare matrice de incidenta din adiacenta

#include <iostream>
#include <fstream>

using namespace std;

int a[10][10], n, m, b[100][100];

void citire();

int main()
{
    citire();
    for(int i=1; i<=n; i++)
    {
        for(int j=1; j<=m; j++)
            cout<<b[i][j]<<"    ";
        cout<<'\n';
    }
    return 0;
}

void citire()
{
    ifstream f("c.in");
    f>>n;
    for(int i=1; i<=n; i++)
        for(int j=1; j<=n; j++)
        {
            f>>a[i][j];
            if(a[i][j] == 1)
            {
                m++;
                b[i][m] = 1;
                b[j][m] = -1;
            }
        }
    f.close();
}
/* c.in */
6
0 1 1 0 0 0
0 0 1 0 0 1
0 0 0 0 0 0
0 0 1 0 1 0
0 0 0 0 0 0
1 0 0 1 1 0