comb

#include <iostream>

using namespace std;

int n, k;
int arr[100];

void f(int p, int last) {
     if (p == k) {
        for (int i = 0; i < k; i++)
            cout << arr[i] << " ";
        cout << endl;
        return;
     }
     if (k - p > n - last)
        return;
     for (int i = last+1; i <= n; i++) {
         arr[p] = i;
         f(p+1, i);
     }

}

int main() {
    freopen("output.txt","w",stdout);
    cin >> n >> k;
    f(0, 0);
}