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Program.cs
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Program.cs
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using System;
namespace LinkedListCycle
{
class ListNode
{
public int val;
public ListNode next;
public ListNode(int x)
{
val = x;
}
}
class Program
{
static void Main(string[] args)
{
}
static public bool HasCycle(ListNode head)
{
ListNode fast = head;
ListNode slow = head;
//set a meet point, if there is a meet point, then it is a cycle list, otherwise not.
ListNode meet = null;
while (fast != null)
{
fast = fast.next;
slow = slow.next;
if (fast == null)
return false;
fast = fast.next;
if(fast == slow)
{
meet = fast;
break;
}
}
if (meet == null)
return false;
else
return true;
}
}
}