[백준 Java] 심화 1 - 1157번: 단어 공부

 

 

import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        String s = br.readLine().toUpperCase();
        int[] count = new int[26];

        for (int i = 0; i < s.length(); i++) {
            count[s.charAt(i) - 'A']++;
        }

        int maxCount = 0;
        char result = '?';

        for (int i = 0; i < count.length; i++) {
            if (count[i] > maxCount) {
                maxCount = count[i];
                result = (char) (i + 'A');
            } else if (count[i] == maxCount) {
                result = '?';
            }
        }

        bw.write(result);

        br.close();
        bw.flush();
        bw.close();
    }
}