[백준] - #5597: 과제 안 내신 분..?

문제 출처 : https://www.acmicpc.net/

 

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#5597: 과제 안 내신 분..? (언어 : Java11)

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제출 답안

import java.util.*;
import java.io.*;
class Main{
    public static void main(String[] args) throws IOException {
        ArrayList<Integer> arr = new ArrayList<Integer>();
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        for(int i=0; i<30; i++)
            arr.add(i+1);
        for(int i=0; i<28; i++)
            arr.remove(arr.indexOf(Integer.parseInt(br.readLine())));
        for(int result : arr)
            System.out.println(result);
    }
}

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