题解 | #统计字符#

#include<iostream>
#include<cctype>
#include<string>

using namespace std;

int main(){
    string input;
    getline(cin, input);
    
    
    int alphaCount=0, spaceCount =0, digitCount=0;
    for(auto c : input){
        if(isalpha(c)){
            alphaCount++;
        }
        if(isspace(c)){
            spaceCount++;
        }
        if(isdigit(c)){
            digitCount++;
        }
    }
    
    cout<<alphaCount<<endl;
    cout<<spaceCount<<endl;
    cout<<digitCount<<endl;
    cout<<input.size()-alphaCount-spaceCount-digitCount<<endl;
    return 0;
}