题解 | #删除有序链表中重复的元素-I#

/**
 * struct ListNode {
 *	int val;
 *	struct ListNode *next;
 * };
 */
/**
 * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
 *
 * 
 * @param head ListNode类 
 * @return ListNode类
 */
#include <stdlib.h>
struct ListNode* deleteDuplicates(struct ListNode* head ) {
    struct ListNode* p = head;
    struct ListNode* q = head->next;
    if (head == NULL) {
        return NULL;
    }

    while (q != NULL) {
        if (p->val == q->val) {
            p->next = q->next;
            free(q);
            q = p->next;
        }
        else {
            p = p->next;
            q = q->next;
        }
    }
    return head;
}