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LeetCode "Remove Duplicates from Sorted List"

The key of this problem is about details especially boundary conditions.

class Solution {public:    ListNode *deleteDuplicates(ListNode *head) {        if(!head) return NULL;        ListNode *p  = head;        ListNode *p0 = p->next;        while(p && p0)           {            while(p && p0 && p->val == p0->val)            {                p->next = p0->next;                p0 = p0->next;            }            p = p0;            if(p0) p0 = p0->next;        }        return head;    }};