题解 | #[NOIP2018]标题统计#

#include <iostream>
#include <cstring>
#include <string.h>
#include <string>

using namespace std;

int main()
{
    string s;
    getline(cin, s);
    int letter=0, digit=0, other=0;
    int sum = 0;
    const char* p = s.c_str();
    for (unsigned int i = 0; i <s.size(); i++)
    {
        if ((*p >= 'a' && *p <= 'z') || (*p >= 'A' && *p <= 'Z'))
        {
            letter++;
        }
        else if ((*p >= '0') && (*p <= '9'))
        {
            digit++;
        }
        p++;
    }
    sum = letter + digit;
    cout << sum << endl;
    return 0;
}