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) {
        List<ListNode> list = new ArrayList<>();
        ListNode pNode = new ListNode(0);
        pNode.next = pHead;
        while (pNode.next != null) {
            pNode = pNode.next;
            if (list.contains(pNode)) {
                return pNode;
            }
            list.add(pNode);
        }
        return null;
    }
}