[JAVA] 백준 1547 공

import java.util.*;

public class Main {

private static Scanner sc = new Scanner(System.in);

public static void main(String[] args) {

int M = sc.nextInt();

int[] cup = new int[4];

cup[1]=1;

for(int i=0;i<M;i++){

int x = sc.nextInt();

int y = sc.nextInt();

int temp = cup[x];

cup[x] = cup[y];

cup[y] = temp;

}

for(int i=1;i<=3;i++){

if(cup[i]==1)

System.out.print(i);

}

}

}