import java.util.*; /* public class ListNode { int val; ListNode next = null; ListNode(int val) { this.val = val; } } */ public class Solution { public ListNode EntryNodeOfLoop(ListNode pHead) { if(pHead==null||pHead.next==null){ return null; } ListNode slow=pHead,quick=pHead; //先进行查找是否有环 while(quic...