题解 | #统计字符#

#include <cctype>
#include <iostream>
#include <string>
#include <unordered_map>
using namespace std;

int main() {
    string s;
    getline(cin, s);
    unordered_map<int, int> map;

    for (auto& ch:s) {
        if(isalpha(ch)){
            map[0] += 1;
        }else if (ch == ' ') {
            map[1] += 1;
        }else if (isdigit(ch)) {
            map[2] += 1;
        }else{
            
           map[3] += 1;
        }
    }

    
        cout<<map[0]<<endl;
        cout<<map[1]<<endl;
        cout<<map[2]<<endl;
        cout<<map[3]<<endl;
   
}
// 64 位输出请用 printf("%lld")