https://pintia.cn/problem-sets/994805342720868352/problems/994805453203030016

This time you are asked to tell the difference between the lowest grade of all the male students and the highest grade of all the female students.

Input Specification:

Each input file contains one test case. Each case contains a positive integer N, followed by N lines of student information. Each line contains a student's name, gender, ID and grade, separated by a space, where name and ID are strings of no more than 10 characters with no space, gender is either F (female) or M (male), and grade is an integer between 0 and 100. It is guaranteed that all the grades are distinct.

Output Specification:

For each test case, output in 3 lines. The first line gives the name and ID of the female student with the highest grade, and the second line gives that of the male student with the lowest grade. The third line gives the difference gradeF−gradeM. If one such kind of student is missing, output Absent in the corresponding line, and output NA in the third line instead.

Sample Input 1:

3 

Joe M Math990112 89 

Mike M CS991301 100 

Mary F EE990830 95

Sample Output 1:

Mary EE990830 

Joe Math990112 

6

Sample Input 2:

1 

Jean M AA980920 60

Sample Output 2:

Absent 

Jean AA980920 

NA

思路：题意大概就是在第一行输入学生人数，后面几行输入学生的姓名，性别，学号，成绩

输出男生的最低分，女生的最高分，最低分与最高分的差值

如果没有男生或者女生输出Absent，成绩差输出NA

首先我们写一个结构体Student，里面有学生的姓名，学号，成绩。令Studeng结构体变量M表示男生的最低分，F表示女生的最高分，temp表示输入的成绩。

输入的成绩如果是男生，并且成绩比M低，则覆盖M，女生同理。