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Description：Given a sorted linked list, delete all duplicates such that each element appear only once.
For example, Given 1->1->2, return 1->2. Given 1->1->2->3->3, return 1->2->3.
给一个有序链表，删除重复的元素。还是首先考虑head == null的情况。
/**
* 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) {
if(head == null)
return null;
ListNode p, q;
q = head;
p = head.next;
while(p != null) {
if(p.val == q.val) {
q.next = p.next;
p.next = null;
p = q.next;
}
else {
p = p.next;
q = q.next;
}
}
return head;
}
}
LeetCode - Remove Duplicates from Sorted List
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原文地址：http://www.cnblogs.com/wxisme/p/4418621.html
