Codeforces Round #192 (Div. 2) (329A)C.Purification

#include <iostream>
#include <stdio.h>
#include <string.h>
using namespace std;

int n ;
char map[110][110];

int main()
{
    
    cin>>n;
    int i , x[110] , y[110] , j;
    memset(x , 0 , sizeof(x));
    memset(y , 0 , sizeof(y));
    for(i = 0;i < n; i++ )
    {
        cin>>map[i];
        for(j = 0; j < n; j++)
        {
            if(map[i][j] == '.')
            {
                x[i] = 1;
                y[j] = 1;
            }
        }
    }
    int b = 0, c = 0;
    for(i = 0; i < n; i++)
    {
        if(x[i] == 0)  b = 1;
        if(y[i] == 0)  c = 1;
    }
    if(b&&c)
    {
        cout<<"-1"<<endl;
        return 0 ;
    }
    if(b == 0)
    {
        for(i = 0; i < n; i++)
            for(j = 0; j < n; j++)
            {
                if(map[i][j] == '.')
                {
                    cout<<i+1<<" "<<j+1<<endl;
                    break;
                }
            }
        return 0;
    }
    if(c == 0)
    {
        for(j = 0; j < n; j++)
            for(i = 0; i < n; i++)
            {
                if(map[i][j] == '.')
                {
                    cout<<i+1<<" "<<j+1<<endl;
                    break;
                }
            }
    }
    return 0;
}