[백준 1547] 공

문제

https://www.acmicpc.net/problem/1547

1547번: 공

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내가 작성한 코드

import java.io.*;
import java.util.StringTokenizer;

public class qor1547 {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        int num = Integer.parseInt(br.readLine());
        boolean[] ball = new boolean[3];
        ball[0] = true;

        for(int i = 0; i<num; i++){
            StringTokenizer st = new StringTokenizer(br.readLine());
            int M = Integer.parseInt(st.nextToken())-1;
            int N = Integer.parseInt(st.nextToken())-1;

            boolean box = ball[M];
            ball[M] = ball[N];
            ball[N] = box;
        }

        for(int i = 0; i<3; i++){
            if(ball[i]){
                bw.write(i+1+"");
            }
        }
        bw.close();
    }
}