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#include <iostream>
#include <stdio.h>
#include <string.h>

using namespace std;

void perm(int list[], int k, int m)
{
    if (k == m)
    {
        for (int i = 0; i <= m; i++)
        {
            printf("%d", list[i]);
        }
        cout << endl;
    }
    else
    {
        for (int i = k; i <= m; i++)
        {
            swap(list[k], list[i]);
            perm(list, k+1, m);
            swap(list[k], list[i]);
        }
    }

}

int main()
{
    int list[] = {1, 2, 3, 4, 5};
    int len = sizeof(list) / sizeof(list[0]);
    perm(list, 0, len-1);
    printf("len: %d\n", len);
    return 0;
}