/* public class ListNode { int val; ListNode next = null; ListNode(int val) { this.val = val; } } */ import java.util.*; public class Solution { public ListNode deleteDuplication(ListNode pHead) { //先使用散列表HashMap记录无重复数字的节点 //以{1,2,2,3,3,4}为例,得到{1:true, 2:false, 3:false, 4:true} HashMap<I...