Remove Duplicats from Sorted List

题目：

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.

分析：

无

解法：

public class Solution {
    /**
     * @param ListNode head is the head of the linked list
     * @return: ListNode head of linked list
     */
    public static ListNode deleteDuplicates(ListNode head) { 
        // write your code here
        if (head == null || head.next == null) {
            return head;
        }
        ListNode curr = head;
        while (curr.next != null) {
            if (curr.val == curr.next.val) {
                curr.next = curr.next.next;
            } else {
                curr = curr.next;
            }
        }
        return head;
    }  
}