#include<bits/stdc++.h>
using namespace std;
int n, k;
int a[20];
int main()
{
	cin >> n >> k;
	for(int i = 1; i <= n; i++) a[i] = i;
	do
	{
		
		for(int i = 1; i <= k; i++) cout << a[i] << " ";
		cout << endl;
	} while(next_permutation(a + 1, a + n + 1));
	return 0;
}

WA on #2