[C++]Numarul de arcuri interioare+exterioare

#include <iostream.h>
#include <fstream.h>

int a[100][100], i, j, n, gr_e, gr_i;

void citire()
{
    ifstream f("citire.in");
    f>>n;
    for(int i=1; i<=n; i++)
        for(int j=1; j<=n; j++)
            f>>a[i][j];
}

int grad_extern(int i)
{
    int gr_e = 0;
    for(j=1; j<=n; j++)
        if(a[i][j] == 1)
            gr_e++;
    return gr_e;
}

int grad_intern(int j)
{
    int gr_i = 0;
    for(i=1; i<=n; i++)
        if(a[i][j] == 1)
            gr_i++;
    return gr_i;
}

int main()
{
    citire();
    for(i=1; i<=n; i++)
    {
        cout<<"Gradul extern al varfului "<<i<<": "<<grad_extern(i)<<endl;
    }
    cout<<endl;
    for(j=1; j<=n; j++)
    {
        cout<<"Gradul intern al varfului "<<j<<": "<<grad_intern(j)<<endl;
    }
    return 0;
}
/* citire.in */
6
0 1 1 0 0 1
0 0 1 1 1 0
0 0 0 1 0 0
0 0 0 0 0 1
0 0 1 0 0 0
0 1 0 0 0 0