★2020/04/18 코딩 문제 연습 (7단계 / 백준 1157) C++

#iclude <iostream>
#include<string>
using namespace std;
 
int main() {
    string word;
    int a[27] = { 0 };
    int max = 0;
    int index;
    int count = 0;
 
    cin >> word;
 
    for (int i = 0; i<word.length(); i++) {
        if (word[i] >= 97) {
            word[i] = word[i] - 32;
        }
        a[word[i] - 65]++;
    }
 
    for (int i = 0; i<26; i++) {
        if (max < a[i]) {
            max = a[i];
            index = i;
        }
    }
    for (int i = 0; i<26; i++) {
        if (i != index) {
            if (max == a[i]) count++;
        }
    }
 
    if (count != 0) cout << "?\n";
    else cout << (char)(index + 65) << "\n";
 
    return 0;
}