小错误：

• string 和 char 的区别：

  • string sex = "F"
  • char sex = 'F'

• 这道题同甲1006，需要不断更新结果。在处理第一个人的输入，你要先把它赋给答案，再去更新，这里用闫老师的写法

  if (boy_name.empty() || score < min_score) ：如果是第一个人，或者分数小于最值就更新。

#include<iostream>
#include<algorithm>

using namespace std;

int main()
{
    string girl_name, girl_id;
    string boy_name, boy_id;
    int min_score, max_score;

    int n;

    cin >> n;
    for(int i = 0; i < n; i ++ ) 
    {
        string name, sex, id;
        int score;

        cin >> name >> sex >> id >> score;
        if (sex == "M")
        {
            if (boy_name.empty() || score < min_score)
            {
                min_score = score;
                boy_name = name;
                boy_id = id;
            }
        }
        if (sex == "F")
        {
            if (girl_name.empty() || score > max_score)
            {
                max_score = score;
                girl_name = name;
                girl_id = id;
            }
        }
    }


    if (girl_name.empty()) cout << "Absent" << endl;
    else cout << girl_name << ' ' << girl_id << endl;

    if (boy_name.empty()) cout << "Absent" << endl;
    else cout << boy_name << ' ' << boy_id << endl;

    if (girl_name.empty() || boy_name.empty()) cout << "NA"<< endl;
    else cout << abs(max_score - min_score) << endl;

    return 0;
}