[백준, BOJ 15652] N과 M (4) (java)

https://www.acmicpc.net/problem/15652

15652번: N과 M (4)

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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
	
	static int N;
	static int M;
	static StringBuilder sb;
	
	private static void sub(int n, int next, int[] arr) {
		
		if(n == M) {
			for (int i = 0; i < M; i++) {
				sb.append(arr[i] + " ");
			}
			sb.append("\n");
			return;
		}
		
		for (int i = next; i <= N; i++) {
			arr[n] = i;
			sub(n + 1, i, arr);
		}
	}

	public static void main(String[] args) throws Exception{

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st;
		sb = new StringBuilder();
		
		st = new StringTokenizer(br.readLine());
		N = Integer.parseInt(st.nextToken());
		M = Integer.parseInt(st.nextToken());
		
		sub(0, 1, new int[M]);
		System.out.println(sb);
	}

}