Remove Duplicates from Sorted List

题目描述

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

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

链接地址

http://www.lintcode.com/en/problem/remove-duplicates-from-sorted-list/

解法

     ListNode *deleteDuplicates(ListNode *head) {
        // write your code here
        if (head == NULL) {
            return head;
        }
        ListNode *dummyNode = head;
       // dummyNode = head;
        while (dummyNode != NULL) {
            if (dummyNode->next != NULL && dummyNode->val == dummyNode->next->val) {
                ListNode *temp = dummyNode->next;
                dummyNode->next = dummyNode ->next->next;
                delete temp;
            } else {
                dummyNode = dummyNode->next;
            }
        }
        return head;
    }