http://oj.leetcode.com/problems/remove-duplicates-from-sorted-list/

Remove Duplicates from Sorted List.java

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