#include <iostream>
 
using namespace std;
 
const int N = 8;
 
int p [N];
int cnt = 0;
 
void place (int s) 
{
    for (int r = 0; r < N; r++) {
        bool ok = true;
        for (int v = 1; v <= s && ok; v++) 
        {
            int d = p[s - v];
            if (d == r || d == r-v || d == r+v)
                ok = false;
        }
        if (ok) 
        {
            p[s] = r;
            if (s < N - 1)
                place(s + 1);
            else 
            {
                cnt++;
                for (int i = 0; i < N; i++) cout << p[i] << " ";
                cout << " : " << cnt << endl;
            }
        }
    }
}
 
int main ()
{
    for (int i = 0; i < N; i++) p[i] = -1;
    place(0);
    std::cout << "O.K." << endl; 
}

Visual Studio 2017: jako první řádku přidejte

#include "pch.h"