题解 | #最小年龄的3个职工#

有一说一，这个c语言的qsort真的很难用，这里cmp的写法需要大家注意下，否则很难过关

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>

typedef struct student{
    int num, age;
    char name[15];
} student;

int cmp(const void *s1, const void *s2) {
    student* a = (student*) s1;
    student* b = (student*) s2;
    if (a->age == b->age && a->num == b->num) return strcmp(a->name, b->name);
    else if (a->age == b->age) return a->num - b->num;
    return a->age - b->age;
}

int main() {
    int n;
    student stu[35];
    while (scanf("%d", &n) != EOF) {
        for (int i = 0; i < n; i++) {
            int num, age;
            char name[15];
            scanf("%d %s %d", &num, name, &age);
            stu[i].num = num;
            strcpy(stu[i].name, name);
            stu[i].age = age;
        }
        qsort(stu, n, sizeof(student), cmp);
        for (int i = 0; i < 3; i++) {
            printf("%d %s %d\n", stu[i].num, stu[i].name, stu[i].age);
        }
    }
    return 0;
}