leetcode-83.刪除有序鏈表中重複的元素

ListNode* deleteDuplicates(ListNode* head) {
    if(!head)
        return head;
    ListNode *p = head;
    while(p->next){
        if(p->val == p->next->val){
            p->next = p->next->next;
        }else{
            p = p->next;
        }
    }
    return head;
}