[백준] 5597 | 과제 안 내신 분..? (java)

쉽게 푼 문제

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

public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] list = new String[30];
		
		for(int i=0;i<28;i++){
			String num = br.readLine();
			list[Integer.valueOf(num)-1] = num;
		}
		
		for(int i=0; i<list.length;i++){
			if(list[i]==null){
				System.out.println(i+1);
			}else continue;
		}
		

	}

}