LeetCode 82. Remove Duplicates from Sorted List

代码：

class Solution {public:    ListNode *deleteDuplicates(ListNode *head)     {   auto cur = head;        while (cur != NULL)   {   auto next = cur->next;   while (next!=NULL && next->val == cur->val)   {   cur->next = next->next;   free(next);   next = cur->next;   }   cur = next;   }   return head;    }};