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 public ListNode detectCycle(ListNode head) {

         ListNode s=head;

         ListNode f=head;

         while(f!=null&&f.next!=null){

             s=s.next;

             f=f.next.next;

             if(s==f){

                 break;

             }

         }

         if(f==null||f.next==null)

             return null;

         s=head;

         while(s!=f){

             s=s.next;

             f=f.next;

         }

         return s;

     }

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