[C++]Grup prieteni +/- vecini

/* *************************************************************************************************************************************
*  Dintr-un grup de n persoane s-au stabilit relatii de pretenie de vecinatate. Determinati grupurile de prieteni, gupurile de vecini. *
************************************************************************************************************************************** */
#include<iostream>
#include<fstream>

using namespace std;

int a[50][50],b[50][50], n, i, j;

void citire();
void prg1();
void prg2();
void prg3();

int main()
{
    citire();
    cout<<"* Prieteni:"<<'\n';
    prg1();
    cout<<'\n'<<"* Vecini:"<<'\n';
    prg2();
    cout<<'\n'<<"** Prieteni & Vecini:"<<'\n';
    prg3();
    return 0;
}

void citire()
{
    ifstream f("citire.in");
    f>>n;
    for(i=1; i<=n; i++)
        for(j=1; j<=n; j++)
            f>>a[i][j];
    for(i=1; i<=n; i++)
        for(j=1; j<=n; j++)
            f>>b[i][j];
}
void prg1()
{
    for(i=1; i<n; i++)
        for(j=i+1; j<=n; j++)
            if(b[i][j]==1)
                cout<<i<<" - "<<j<<'\n';

}
void prg2()
{
    for(i=1; i<n; i++)
        for(j=i+1; j<=n; j++)
            if(a[i][j]==1)
                cout<<i<<" - "<<j<<'\n';
}
void prg3()
{
    for(i=1; i<n; i++)
        for(j=i+1; j<=n; j++)
            if(a[i][j]==1 && b[i][j]==1)
                cout<<i<<" - "<<j<<'\n';
}
/* citire.in */
7
0 1 0 1 0 0 1
1 0 1 0 0 0 0
0 1 0 1 0 0 0
1 0 1 0 1 0 0
0 0 0 1 0 1 0
0 0 0 0 1 0 1
1 0 0 0 0 1 0
0 0 1 1 1 0 0
0 0 0 0 0 1 0
1 0 0 0 0 0 0
1 0 0 0 0 0 0
1 0 0 0 0 0 1
0 1 0 0 0 0 0
0 0 0 0 1 0 1