这种排序查找的题太多了
对于我现阶段来说并没有特别大的提升，但是为了提交AC时爽一下，我还是再刷了一遍。

#include<cstdio>
#include<string>
#include<iostream>
using namespace std;
int main(){
	int n;
	cin>>n;
	string namef,idf,namem,idm,name,id;
	char sex;
	int grade,gradem=101,gradef=-1;
	for(int i=0;i<n;i++){
		cin>>name>>sex>>id>>grade;
		if(sex=='M'){
			if(grade < gradem){
				gradem = grade;
				namem = name;
				idm = id;
			}
		}else{
			if(grade > gradef){
				gradef = grade;
				namef = name;
				idf = id;
			}
		}
	}
	if(gradef==-1) cout<<"Absent"<<endl;
	else cout<<namef<<" "<<idf<<endl;
	if(gradem==101) cout<<"Absent"<<endl;
	else cout<<namem<<" "<<idm<<endl;
	if(gradef==-1 || gradem==101) cout<<"NA"<<endl;
	else cout<<gradef-gradem<<endl;
	return 0;
}