PAT1036. Boys vs Girls (25)

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
struct Student{
string name;
string gender;
string id;
int grade;
int idd;
};
int n;
bool cmp(Student a,Student b){
return a.grade<b.grade;
}
vector<Student> studentSet;
int main(){
cin>>n;
for(int i=0;i<n;i++){
Student s;
cin>>s.name>>s.gender;
cin>>s.id>>s.grade;
s.idd=i;
studentSet.push_back(s);
}
sort(studentSet.begin(),studentSet.end(),cmp);
int p=-1,q=-1;
for(int i=0;i<n;i++){
if(studentSet[i].gender[0]=='M'){
if(p==-1){p=i;}
}
if(studentSet[i].gender[0]=='F'){
q=i;
}
}
int flag=-1;
if(q==-1){
cout<<"Absent"<<endl;
flag=1;
}else{
cout<<studentSet[q].name<<" "<<studentSet[q].id<<endl;
}
if(p==-1){
cout<<"Absent"<<endl;
flag=1;
}else{
cout<<studentSet[p].name<<" "<<studentSet[p].id<<endl;
}
if(flag==-1){
cout<<(studentSet[q].grade-studentSet[p].grade)<<endl;
}else{
cout<<"NA"<<endl;
}
    return 0;
}