kingsubin

import java.io.*;
import java.util.Scanner;
 
public class boj_15651 {
    static Scanner sc = new Scanner(System.in);
    static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
    static int[] numbers = new int[10];
    static boolean[] v = new boolean[10];
    static int n, m;
 
    public static void main(String[] args) throws IOException {
        n = sc.nextInt();
        m = sc.nextInt();
 
        func(0);
        bw.flush();
        bw.close();
    }
 
    static void func(int k) throws IOException {
        if (k == m) {
            for (int i = 0; i < m; i++) {
                bw.append(numbers[i] + " ");
            }
            bw.newLine();
            return;
        }
 
        for (int i = 1; i <= n; i++) {
            numbers[k] = i;
            v[i] = true;
 
            func(k + 1);
            v[i] = false;
        }
 
    }
}
 

 

- 백트래킹

 

- 기존에서 중복이 가능하단것만 바뀜

 

 

 

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www.acmicpc.net/problem/15651