Leetcode(83) Remove Duplicates from Sorted List

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Description

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

Example 1:

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Input: 1->1->2
Output: 1->2

Example 2:

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Input: 1->1->2->3->3
Output: 1->2->3

解法

基本的链表操作，双指针法，注意空表的处理。

具体代码如下：

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class Solution {
    public ListNode deleteDuplicates(ListNode head) {
        if (head == null) {
            return head;
        }
        ListNode pre = head;
        ListNode tmp = head.next;
        while (tmp != null) {
            if (tmp.val == pre.val) {
                pre.next = tmp.next;
                tmp = tmp.next;
            } else {
                pre = tmp;
                tmp = tmp.next;
            }
        }
        return head;
    }
}