C言語のリンクリストは同じ学籍番号を持つノードを削除します

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

// 定义学生结构体
struct Student {
    int studentID;
    struct Student* next;
};

// 删除相同学号的节点函数
struct Student* deleteDuplicates(struct Student* head) {
    if (head == NULL || head->next == NULL) {
        return head;
    }
    
    struct Student* current = head;
    
    while (current->next != NULL) {
        if (current->studentID == current->next->studentID) {
            struct Student* duplicate = current->next;
            current->next = duplicate->next;
            free(duplicate);
        } else {
            current = current->next;
        }
    }
    
    return head;
}

// 打印链表函数
void printList(struct Student* head) {
    struct Student* current = head;
    
    while (current != NULL) {
        printf("Student ID: %d\n", current->studentID);
        current = current->next;
    }
}

int main() {
    // 创建链表
    struct Student* head = (struct Student*)malloc(sizeof(struct Student));
    head->studentID = 1;
    
    struct Student* second = (struct Student*)malloc(sizeof(struct Student));
    second->studentID = 2;
    
    struct Student* third = (struct Student*)malloc(sizeof(struct Student));
    third->studentID = 3;
    
    struct Student* fourth = (struct Student*)malloc(sizeof(struct Student));
    fourth->studentID = 2;
    
    head->next = second;
    second->next = third;
    third->next = fourth;
    fourth->next = NULL;
    
    printf("Original Linked List:\n");
    printList(head);
    
    // 删除相同学号的节点
    head = deleteDuplicates(head);
    
    printf("Linked List after removing duplicates:\n");
    printList(head);
    
    // 释放内存
    struct Student* current = head;
    while (current != NULL) {
        struct Student* temp = current;
        current = current->next;
        free(temp);
    }
    
    return 0;
}