[15651] N과 M(3) - Java

백준 N과 M(3) (실버 Ⅲ)

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

public class N과M_3 {
    static int n;
    static int m;
    static StringBuilder sb = new StringBuilder();
    static int[] path;
    public static void main(String[] args) throws IOException {
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(bf.readLine());
        n = Integer.parseInt(st.nextToken());
        m = Integer.parseInt(st.nextToken());
        path = new int[m];
        recursion(0);
        System.out.println(sb);
    }

    private static void recursion(int level) {
        if(level == m) {
            for(int value : path) {
                sb.append(value + " ");
            }
            sb.append("\n");
            return;
        }

        for(int i = 1; i <= n; i++) {
            path[level] = i ;
            recursion(level + 1);
            path[level] = 0;
        }
    }
}

 

BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(bf.readLine());

속도를 위해서 BufferedReader과 StringTokenizer 사용