题解 | #牛群排列去重#

/**
 * 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
 */
struct ListNode* deleteDuplicates(struct ListNode* head ) {
    // write code here
    struct ListNode*pre,*q;
    if(head==NULL||head->next==NULL)
    return head;
    pre = head;
    q = pre->next;
    while (q) {
    if(pre->val==q->val)
    {
        pre->next = q->next;
        q = q->next;
    }
    else {
    pre = q;
    q = q->next;
    }
    }

    return head;
}