Leetcode 83. 删除排序链表中的重复元素

 83. Remove Duplicates from Sorted List

解题代码：

class Solution {
public:
    ListNode* deleteDuplicates(ListNode* head) 
    {
        ListNode* p = head;       
        while (p && p -> next ) 
        {
            if (p -> val == p -> next -> val) 
                p -> next = p -> next -> next;
            else 
                p = p -> next;
        }
        return head;
    }
};