40分求解答！！样例跑过了，不知道怎么改

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>

using namespace std;

int num[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
int a, b, c;

int cal(int l, int r)
{
    int res = 0;
    for (int i = l; i <= r; i++)
    {
        res = res * 10 + num[i];
    }
    return res;
}

int main()
{
    std::cin >> a >> b >> c;
    int cnt = 0;

    while (std::next_permutation(num, num + 9))
    {
        for (int i = 0; i < 9; i++)
        {
            for (int j = i + 1; j < 9; j++)
            {
                int x = cal(0, i);
                int y = cal(i + 1, j);
                int z = cal(j + 1, 8);

                if (b * c * x == a * c * y && a * c * y == a * b * z)
                {
                    std::cout << x << ' ' << y << ' ' << z << std:: endl;
                    cnt++;
                }
            }
        }
    }

    if (cnt == 0) std::cout << "N0!!!";

    return 0;
}