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) {
        ListNode temp = pHead;
        ArrayList<ListNode> list = new ArrayList<>();
        while (temp != null) {
            for (ListNode listNode : list) {
                if (listNode.equals(temp)){
                    return listNode;
                }
            }
            list.add(temp);
            temp = temp.next;
        }
        return null;
    }
}