N과M(4) -중복조합-

package N과M;

import java.util.*;

public class N과M4 {
	
	public static boolean visit[];
	public static int N,M;
	public static int[] arr;
	public static int[] num;
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		N = sc.nextInt();
		M = sc.nextInt();
		
		visit = new boolean[M];
		num = new int[N];
		arr = new int[M];
		
		for (int i = 0; i < N; i++) num[i] = i+1;
		
		permcomb(0,0);
	}
	public static void permcomb(int start, int cnt) {
		if(cnt == M) {
			for (int i = 0; i < arr.length; i++) {
				System.out.print(arr[i] + " ");
			}
			System.out.println();
			return;
		}
		
		for (int i = start; i < N; i++) {
			arr[cnt] = num[i];
			permcomb(i, cnt + 1);

		}
	}
}

기본적인 중복 조합 코드