用c语言

以下是一个用C语言实现的代码示例：

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

#define MAX_N 50

typedef struct {
    char id[6];
    int month;
    int day;
} Student;

int cmp(const void *a, const void *b) {
    Student *s1 = (Student *) a;
    Student *s2 = (Student *) b;
    if (s1->month != s2->month) {
        return s1->month - s2->month;
    }
    return s1->day - s2->day;
}

void Count() {
    // 读取数据
    int n;
    scanf("%d", &n);
    Student students[MAX_N];
    for (int i = 0; i < n; i++) {
        scanf("%s %d %d", students[i].id, &students[i].month, &students[i].day);
    }

    // 统计生日相同的学生信息
    qsort(students, n, sizeof(Student), cmp);
    int prev_month = -1, prev_day = -1;
    for (int i = 0; i < n; i++) {
        if (students[i].month != prev_month || students[i].day != prev_day) {
            printf("%02d %02d", students[i].month, students[i].day);
            prev_month = students[i].month;
            prev_day = students[i].day;
        }
        printf(" %s", students[i].id);
    }
    printf("\n");
}

int main() {
    Count();
    return 0;
}

此C语言代码中，我们依然是先读取数据，然后使用qsort函数（C语言标准库提供的快速排序函数）按日期排序。最后按日期顺序输出生日相同的学生信息。