Bt2

#include <iostream>
#include <cstring>

using namespace std;

int st[100], i, n;

void backtrack(int k)
{
    if(k == n+1)
    {
        for(i = 1; i <= n; i++)
            cout << st[i] << " ";
        cout << "\n";
    }
    else
    {
        st[k] = 0;
        while(st[k] < n)
        {
            st[k]++;
            backtrack(k+1);
        }
    }
}

int main()
{
    cin >> n;
    backtrack(1);
    return 0;
}