A1083 List Grades (25)（25 分）

A1083 List Grades (25)（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

AC代码

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
#define  maxn  50
struct Student {
    char name[11];
    char id[11];
    int grade;
}stu[maxn];
int cmp(const void*a, const void*b) {
//	struct Student*aa=(Student*)a;
//	struct Student*bb=(Student*)b;
	struct Student*aa=a;
  	struct Student*bb=b;
    return aa->grade < bb->grade ? 1:-1;//为实现成绩降序，c++ 是>，c语言则是<,1<2返回正值，1==2返回0,1>2，返回负值
}
int main() {
    int n, left, right;
    scanf("%d", &n);
    for(int i = 0; i < n; i++) {
        scanf("%s %s %d", stu[i].name, stu[i].id, &stu[i].grade);
    }
    scanf("%d%d", &left, &right);
    qsort(stu,n,sizeof(stu[0]), cmp);
    bool flag = false;
    for(int i = 0; i < n; i++) {
        if(stu[i].grade >= left && stu[i].grade <= right) {
            printf("%s %s\n", stu[i].name, stu[i].id);
            flag = true;
        }
    }
    if(flag == false) {
        printf("NONE\n");
    }
    return 0;
}