Java :

import java.util.Scanner;

public class Main {
	static int M,N;
	static int [] arr;
	public static void main(String[] args) {
		Scanner cin = new Scanner(System.in);
		M = cin.nextInt();
		N = cin.nextInt();
		arr = new int[N+1];
		combin(M,N);
	}
	public static void combin(int m,int n) {
		if(n == 0) {
			for(int i = 1; i <= N; i ++) {
				System.out.print(arr[i]);
				if(i == N)
					System.out.println();
				else
					System.out.print(" ");
			}
		}else if(m < n){
			return ;
		}else {
			combin(m-1,n);
			arr[n] = m;
			combin(m-1,n-1);
			}
		}
}