[C++]Graf Hamiltonian

#include <iostream>
#include <fstream>

using namespace std;

int a[100][100], i, j, n, p, viz[10];

void citire();
int grad(int a);
int hemiltonian();

int main()
{
    citire();
    if(hemiltonian())
        cout<<"     **  Graficul nu este hemiltonian        **      ";
    else cout<<"    **  Graficul este hemiltonian   **  ";
    return 0;
}

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

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

int hemiltonian()
{
    for(i=1; i<=n; i++)
        if(grad(i)<=n/2)
            return 0;
    return 1;
}
/* citire.in */
    8 1
0 1 0 1 0 0 0 0
1 0 1 0 1 0 0 1
0 1 0 0 0 0 0 1
1 0 0 0 1 1 1 0
0 1 0 1 0 0 1 1
0 0 0 1 0 0 1 0
0 0 0 1 1 1 0 1
0 1 1 0 1 0 1 0