Remove Duplicates from Sorted List

/** * Definition for singly-linked list. * struct ListNode { *     int val; *     ListNode *next; *     ListNode(int x) : val(x), next(NULL) {} * }; */class Solution {public:    ListNode *deleteDuplicates(ListNode *head) {        if(head == NULL)        return head;        ListNode *head1 = head;        int pre = head->val;        while(head->next != NULL)        {            ListNode *temp = head;            head = head->next;            if(head->val == pre)            {               temp->next = temp->next->next;               head = temp;            }            else            pre = head->val;        }        return head1;    }};

问题比较简单，保存相似节点的第一个值，然后遍历链表，若后一节点与当前节点值

相同则删除此节点，若不是则跟新这个标准值