To fix the error – found cycle in the listnode issue, create two separate linked lists for the odd and even nodes, and add the nodes to the appropriate list while you iterate through an original linked list.
The error – found cycle in the listnode occurs when there is a problem with a linked list data structure, where a node in the list has a reference to another node earlier in the list, creating a cycle.
The cycle can cause problems when iterating a list, as the algorithm will never reach the end of the list and may end up in an infinite loop.
See the below algorithmic code that generates an error – found cycle in the listnode in linked list data structure.
odd = head
even = head.next
while odd:
if odd.next and odd.next.next:
odd.next = odd.next.next
odd = odd.next
else:
break
odd.next = evenIn this algorithmic code, we are trying to split a linked list into two separate lists:
- Containing the odd-numbered nodes
- Containing the even-numbered nodes
The main problem with the above code is that we use the same linked list for both the odd and even lists. Therefore, you modify the list by changing the next pointers of the nodes, and it will cause errors if you try to iterate the list again after the changes, as the structure of the list has been changed.
See the below algorithmic implementation to resolve the issue.
odd_list = ListNode(None)
even_list = ListNode(None)
odd_tail = odd_list
even_tail = even_list
current = head
is_odd = True
while current:
if is_odd:
odd_tail.next = current
odd_tail = current
else:
even_tail.next = current
even_tail = current
is_odd = not is_odd
current = current.next
odd_tail.next = None
even_tail.next = None
odd_head = odd_list.next
even_head = even_list.next
Let me explain this algorithm.
We created two separate lists for the odd and even nodes and added the nodes to the appropriate list as it iterated through the original list.
It also sets the next pointers of the last nodes in the odd and even lists to None to avoid creating a cycle.
This is the best and most efficient approach to solve error – found cycle in the listnode.
That’s it. Have a great holiday!
Krunal Lathiya is a seasoned Computer Science expert with over eight years in the tech industry. He boasts deep knowledge in Data Science and Machine Learning. Versed in Python, JavaScript, PHP, R, and Golang. Skilled in frameworks like Angular and React and platforms such as Node.js. His expertise spans both front-end and back-end development. His proficiency in the Python language stands as a testament to his versatility and commitment to the craft.
