[LeetCode] Remove Duplicates from Sorted List 链表

Given a sorted linked list, delete all duplicates such that each element appear only once.

For example,
Given 1->1->2, return 1->2.
Given 1->1->2->3->3, return 1->2->3.

 

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 Linked List

 

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