I got this code which is supposed to provide an algorithm that searches for the item in the middle of a doubly-linked list.
There may be one or more flaws in the code making the code not executable.
How can this code be implemented to make it work using a linked list?
And what are the problems in the code itself?
node1 = self.head node2 = self.tail while node1 != node2: node1 = node1.next node2 = node2.previous return node1.value
The problem is you ‘step’ both nodes at the same time inside the loop.
You can thus miss the middle because they can jump over each other without being detected.
You should step one node at a time in each loop iteration.
The solution could be something like this:
node1 = self.head node2 = self.tail step_node_1 = True while node1 != node2: if step_node_1: node1 = node1.next step_node_1 = False else: node2 = node2.previous step_node_1 = True return node1.value