PAT 1083 List Grades

#include <cmath>
#include <vector>
#include <climits>
#include <iostream>
#include <string>
#include <map>
#include <queue>
#include <set>
#include <algorithm>

using namespace std;

class GradeRecord {
public:
  string name;
  string id;
  int grade;
};

bool compare1083(GradeRecord r1, GradeRecord r2) {
  return r1.grade > r2.grade;
}

int main() {
  int N, lower, higher;
  cin >> N;

  vector<GradeRecord> table(N);
  for (int i = 0; i < N; i++) {
    cin >> table[i].name >> table[i].id >> table[i].grade;
  }
  cin >> lower >> higher;

  sort(table.begin(), table.end(), compare1083);

  bool isPrint = false;
  for (int i = 0; i < N; i++) {
    if (table[i].grade >= lower && table[i].grade <= higher) {
      cout << table[i].name << " " << table[i].id << endl;
      isPrint = true;
    }
  }
  if (!isPrint) {
    cout << "NONE";
  }
  return 0;
}