[Java] baekjoon 1157 : 단어 공부 / 문자열

문제 

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https://www.acmicpc.net/problem/1157

1157번: 단어 공부

구현 

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import java.util.*;
 
public class Main {
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner sc = new Scanner(System.in);
 
        String word = sc.next().toUpperCase(); 
        int[] alphabet = new int[26]; 
 
        for (int i = 0; i < word.length(); i++) {
            alphabet[word.charAt(i) - 'A']++;
        }
 
        int max = 0;
        int idx = 0;
        for (int i = 0; i < alphabet.length; i++) {
            if (alphabet[i] > max) {
                max = alphabet[i];
                idx = i;
            }
        }
        char res = (char) (idx + 'A');
 
        for (int i = 0; i < alphabet.length; i++) {
            if (max == alphabet[i] && idx != i) {
                res = '?';
            }
        }
        System.out.println(res);
    }
}

결과 

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