LeetCode-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:

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

Example 2:

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

题意：将给定的已排序链表中重复的元素去除，返回新的链表；

解法：因为此时的链表是已经排序好的了，我们只需要判断当前元素是否和前一个元素是相同的，就可以找出重复的元素；

Java

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
class Solution {
    public ListNode deleteDuplicates(ListNode head) {
        ListNode next = head;
        while (next != null) {
            if (next.next != null && next.next.val == next.val) {
                next.next = next.next.next;
            } else {
                next = next.next;
            }
        }
        return head;
    }
}