[백준 1032] 명령 프롬포트

문제

https://www.acmicpc.net/problem/1032

1032번: 명령 프롬프트

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내가 작성한 코드

import java.io.*;

public class qor1032 {
    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());

        String[] file = new String[num];
        for(int i = 0; i<num; i++){
            file[i] = br.readLine();
        }

        for(int i = 0; i<file[0].length(); i++){
            boolean state = true;

            for(int j = 0; j<num-1; j++){
                if(file[j].charAt(i) != file[j+1].charAt(i)){
                    state = false;
                    break;
                }
            }

            if(state == true){
                bw.write(file[0].charAt(i));
            }
            else{
                bw.write("?");
            }
        }

        bw.close();
    }
}