学步园

#include<stdio.h>
#include<string.h>
struct Stu{
  char name[12];
  char sex[2];
  char id[12];
  int grade;
}stu,higF,lowM;
int main(){
  int i,j,n;
  higF.grade=-1;lowM.grade=101;
  scanf("%d",&n);
  for(i=0;i<n;i++){
    scanf("%s %s %s %d",stu.name,stu.sex,stu.id,&stu.grade);
    if(strcmp(stu.sex,"F")==0&&stu.grade>higF.grade) higF=stu;
    if(strcmp(stu.sex,"M")==0&&stu.grade<lowM.grade) lowM=stu;
  }
  if(higF.grade==-1) printf("Absent\n");
  else printf("%s %s\n",higF.name,higF.id);
  if(lowM.grade==101) printf("Absent\n");
  else printf("%s %s\n",lowM.name,lowM.id);
  if(higF.grade==-1||lowM.grade==101) printf("NA\n");
  else printf("%d\n",higF.grade>lowM.grade?higF.grade-lowM.grade:lowM.grade-higF.grade);
  return 0;
}