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Main.java
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Main.java
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package com.company;
class ListNode {
int val;
ListNode next;
ListNode(int x) {
val = x;
next = null;
}
}
public class Main {
public static void main(String[] args) {
// write your code here
}
public ListNode detectCycle(ListNode head) {
ListNode fast = head, slow = head, meet = null;
while (fast != null && slow != null){
fast = fast.next;
if(fast == null) return null;
fast = fast.next;
slow = slow.next;
if(fast == slow){
meet = fast;
break;
}
}
if(meet == null) return null;
while (meet != head){
meet = meet.next;
head = head.next;
}
return head;
}
}