[백준][Java] 1032번 명령 프롬프트 (String)

 

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
 
 
public class Main {
        
    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    private static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
    
    
    public static void main(String[] args) throws IOException{
        int N = Integer.parseInt(br.readLine());
        StringBuilder sBuilder = new StringBuilder();
        
        String[] fileNames = new String[N];
        for(int i=0; i<N; i++) {
            fileNames[i] = br.readLine();
        }
        
        
        UpperLoop : 
        for(int i=0; i<fileNames[0].length(); i++) {
            for(int j=0; j<N ;j++) {
                if(fileNames[j].charAt(i)!=fileNames[0].charAt(i)) {
                    sBuilder.append("?");
                    continue UpperLoop;
                }
            }
            sBuilder.append(fileNames[0].charAt(i));
        }
        
        
        bw.write(sBuilder.toString()); 
        
        
        bw.flush(); 
        bw.close();
    }
}