[백준 1157] 단어 공부

1157번: 단어 공부

 

답안

import java.util.Scanner;

public class Main {
    public static int[] getAlphabetCount(String str) {
        int[] alpCount = new int[26];
        for (int i=0; i < str.length(); i++) {
            alpCount[str.charAt(i) - 'A']++;
        }
        return alpCount;
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String str = sc.next().toUpperCase();
        int[] alpCount = getAlphabetCount(str);

        int maxCount = -1;
        char maxAlphabet = '?';
        for (int i=0; i<alpCount.length; i++) {
            if (maxCount < alpCount[i]) {
                maxCount = alpCount[i];
                maxAlphabet = (char)('A' + i);
            } else if (maxCount == alpCount[i]) {
                maxAlphabet = '?';
            }
        }
        System.out.println(maxAlphabet);
    }
}