PAT 甲级 1083 List Grades （25 分）

1083 List Grades （25 分）

Given a list of N student records with name, ID and grade. You are supposed to sort the records with respect to the grade in non-increasing order, and output those student records of which the grades are in a given interval.

Input Specification:

Each input file contains one test case. Each case is given in the following format:

N
name[1] ID[1] grade[1]
name[2] ID[2] grade[2]
... ...
name[N] ID[N] grade[N]
grade1 grade2

where name[i] and ID[i] are strings of no more than 10 characters with no space, grade[i] is an integer in [0, 100], grade1 and grade2 are the boundaries of the grade's interval. It is guaranteed that all the grades are distinct.

Output Specification:

For each test case you should output the student records of which the grades are in the given interval [grade1, grade2] and are in non-increasing order. Each student record occupies a line with the student's name and ID, separated by one space. If there is no student's grade in that interval, output NONE instead.

Sample Input 1:

4
Tom CS000001 59
Joe Math990112 89
Mike CS991301 100
Mary EE990830 95
60 100

Sample Output 1:

Mike CS991301
Mary EE990830
Joe Math990112

Sample Input 2:

2
Jean AA980920 60
Ann CS01 80
90 95

Sample Output 2:

NONE

#include<iostream>
#include<set>
#include<string>

using namespace std;

struct student
{
  string name;
  string ID;
  int grade;
  
  bool operator<(const student stu) const
  {
    if(grade < stu.grade)
      return true;
    else
      return false;
  }
  
  bool operator>(const student stu) const
  {
    if(grade > stu.grade)
      return true;
    else
      return false;
  }
};

int main()
{
  int N ,flag = 1,grade1,grade2;
  student stu;
  set<student> s;
  
  cin>>N;
  
  for(int i=0;i<N;++i)
  {
    cin>>stu.name>> stu.ID>>stu.grade;
    
    s.insert(stu);
  }
  
  cin>>grade1>>grade2;
  
  set<student>::reverse_iterator begin = s.rbegin(),end = s.rend(),i;
  
  for(i=begin;i!=end;++i)
  {
    if((*i).grade >= grade1 && (*i).grade <= grade2)
    {
      cout<<i->name<<" "<<i->ID<<endl;
      flag = 0;
    }
  }
  
  if(flag)
    cout<<"NONE"<<endl;
}