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Program.cs
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Program.cs
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using System;
namespace LinkedListCycleII
{
class ListNode
{
public int val;
public ListNode next;
public ListNode(int x)
{
val = x;
}
}
class Program
{
static void Main(string[] args)
{
}
static public ListNode DetectCycle(ListNode head)
{
ListNode fast = head;
ListNode slow = head;
ListNode meet = null;
while (fast != null)
{
fast = fast.next;
slow = slow.next;
if (fast != null)
{
fast = fast.next;
if(fast == slow)
{
meet = fast;
break;
}
}
else
return null;
}
if (meet == null)
return null;
while (true)
{
if (head == meet)
{
return head;
}
head = head.next;
meet = meet.next;
}
}
}
}