PAT A 1083 List Grades

#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;

struct STU{
    char name[15];
    char id[15];
    int grade;
};

bool cmp(STU a,STU b)
{
    return a.grade>b.grade;
}

int main()
{
    int n,grade1,grade2;
    int i,j;
    cin>>n;
    STU stu[n];
    for(i=0;i<n;i++){
        scanf("%s%s%d",stu[i].name,stu[i].id,&stu[i].grade);
    }
    cin>>grade1>>grade2;
    sort(stu,stu+n,cmp);
    int cnt=0;  //计算有效人数
    for(i=0;i<n;i++){
        if(stu[i].grade>=grade1&&stu[i].grade<=grade2){
            printf("%s %s\n",stu[i].name,stu[i].id);
            cnt++;
        }
    }
    if(cnt==0)      printf("NONE\n");
    return 0;
}