1 #include <vector> 2 #include <string> 3 #include <iostream> 4 #include <fstream> 5  6 using namespace std; 7  8 #define OJ 9 10 #ifdef OJ11 #define fin cin12 #endif13 14 struct Student{15     string name;16     bool is_male;17     string id;18     int grade;19 };20 21 int main(){22 #ifndef OJ23     ifstream fin("in.data");24 #endif25 26     int N;27     fin >> N;28 29     vector<Student> students;30     for (int i = 0; i < N; i++){31         Student stu;32         fin >> stu.name;33 34         char gender;35         fin >> gender;36 37         stu.is_male = (gender == ‘M‘ ? true : false);38 39         fin >> stu.id;40         fin >> stu.grade;41 42         students.push_back(stu);43     }44 45     int male_grade = 101;46     int femail_grade = -1;47     int male_idx, femail_idx;48     for (int i = 0; i < N; i++){49         Student &stu = students[i];50         if (stu.is_male){51             if (stu.grade < male_grade){52                 male_grade = stu.grade;53                 male_idx = i;54             }55         }56         else if (stu.grade > femail_grade){57             femail_grade = stu.grade;58             femail_idx = i;59         }60     }61 62     bool na = false;63     if (femail_grade == -1){64         cout << "Absent" << endl;65         na = true;66     }67     else {68         cout << students[femail_idx].name << " " << students[femail_idx].id << endl;69     }70     if (male_grade == 101){71         cout << "Absent" << endl;72         na = true;73     }74     else {75         cout << students[male_idx].name << " " << students[male_idx].id << endl;76     }77     78 79     if (na){80         cout << "NA" << endl;81     }82     else {83         cout << femail_grade - male_grade << endl;84     }85 86     return 0;87 }