B1042 字符统计 (20 分)

#include<cstdio>
#include<iostream>
#include<algorithm>
#include<string>
using namespace std;
int hashTable[26];
int main(){
    string str;
    getline(cin, str);
    int len = str.length();
    for(int i = 0; i < len; i++){
        if(str[i] >= 'a' && str[i] <= 'z'){
            int a = str[i] - 'a';
            hashTable[a]++;
        }
        if(str[i] >= 'A' && str[i] <= 'Z'){
            int a = str[i] - 'A';
            hashTable[a]++;
        }
    }
    int num = 0;
    int index = 0;
    for(int i = 0; i < 26; i++){
        if(hashTable[i] > num){
            index = i;
            num = hashTable[i];
        }
    }
    printf("%c %d", 'a'+index, num);
}