// 九数组分数
#include <stdio.h>

void test(int x[])
{
    int a = x[0] * 1000 + x[1] * 100 + x[2] * 10 + x[3];
    int b = x[4] * 10000 + x[5] * 1000 + x[6] * 100 + x[7] * 10 + x[8];

    if (a * 3 == b)
        printf("%d / %d\n", a, b);
}

void f(int x[], int k)
{
    int i, t;
    if (k >= 9)
    {
        test(x);
        return;
    }

    for (i = k; i < 9; i++)
    {
        {
            t = x[k];
            x[k] = x[i];
            x[i] = t;
        }
        f(x, k + 1);
        {
            t = x[i];
            x[i] = x[k];
            x[k] = t;
        }
    }
}

int main()
{
    int x[] = {1, 2, 3, 4, 5, 6, 7, 8, 9};
    f(x, 0);
    return 0;
}