字符串处理：PAT1036 Boys vs Girls

#include 
using namespace std;

int main()
{
    string male_name,male_id;
    string female_name, female_id;
    int male_grade, female_grade;
    int n;
    cin >> n;
    string name, gender, id;
    int grade;
    for (int i = 0; i < n; i++)
    {
        cin >> name >> gender >> id >> grade;
        if (gender == "M")
        {
            if (male_name.empty() || male_grade > grade)
            {
                male_name = name;
                male_id = id;
                male_grade = grade;
            }
        }
        else
        {
            if (female_name.empty() || female_grade < grade)
            {
                female_grade = grade;
                female_id = id;
                female_name = name;
            }
        }
    }
    if (female_name.empty())
    {
        cout << "Absent" << endl;
    }
    else
    {
        cout << female_name << " " << female_id << endl;
    }
    if (male_name.empty())
    {
        cout << "Absent" << endl;
    }
    else
    {
        cout << male_name << " " << male_id << endl;
    }
    if (female_name.empty() || male_name.empty())
    {
        cout << "NA";
    }
    else
    {
        cout << female_grade - male_grade;
    }
    

    return 0;
}