题解 | #链表中环的入口结点#
链表中环的入口结点
https://www.nowcoder.com/practice/253d2c59ec3e4bc68da16833f79a38e4
import java.util.HashMap;
import java.util.Map;
/*
public class ListNode {
int val;
ListNode next = null;
ListNode(int val) {
this.val = val;
}
}
*/
public class Solution {
public ListNode EntryNodeOfLoop(ListNode pHead) {
Map<ListNode, Integer> map = new HashMap<>();
while (pHead != null) {
if (map.containsKey(pHead)) {
return pHead;
} else {
map.put(pHead, 1);
pHead = pHead.next;
}
}
return null;
}
}
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