TADM2E 3.27

<pre> 1) Take two pointers Fast and Slow (Slow jumps one step at a time while Fast two step) 2) While (Fast != NULL)

       if(Fast == Slow)
             return true;
       else
            fast = fast->next->next
            slow = slow->next

3) return false; After detecting loop stop one pointer and increment other pointer by 1 step untill Loop

   if (fast == slow)
   break;

else

   slow++
   LoopLength++

EndLoop

You can find out loop start position also. Once you have LoopLenght.

1. Fast = Slow = Start 2. Fast += LoopLenght 3. Loop

   If Fast != Slow
   Fast++;
   Slow++

EndLoop 4. Fast and Slow Both are pointing to the start of loop position. Now you can break the Loop in link list. </pre> --Max 06:18, 25 June 2010 (EDT)