[Baekjoon Online Judge] 10974 - 모든 순열 / Java

https://www.acmicpc.net/problem/10974

10974번: 모든 순열

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	static int N, input[], output[];

	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		N = Integer.parseInt(br.readLine());

		input = new int[N];
		output = new int[N];
		
		for (int i = 0; i < N; i++) {
			input[i] = i + 1;
		}

		permutation(0, 0);
	}

	public static void permutation(int cnt, int flag) {
		if (cnt == N) {
			for (int i = 0; i < N; i++) {
				System.out.print(output[i] + " ");
			}
			System.out.println();
			return;
		}

		for (int i = 0; i < N; i++) {
			if ((flag & (1 << i)) != 0) {
				continue;
			}
			output[cnt] = input[i];
			permutation(cnt + 1, flag | (1 << i));
		}
	}
}