题解 | #链表中环的入口结点#

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) {
        Deque<ListNode> listNodeDeque = new LinkedList<>();
        while (pHead != null) {
            if (listNodeDeque.contains(pHead)) {
                return pHead;
            } else {
                listNodeDeque.add(pHead);
            }
            pHead = pHead.next;
        }
        return null;
    }
}