Solution: Odd Even Linked List
Understand how to rearrange nodes in a singly linked list so that all nodes at odd indexes come before those at even indexes. This lesson teaches in-place linked list manipulation using constant extra space and linear time complexity, preserving the original node order within groups. Master the use of pointers to solve this common coding interview problem efficiently.
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Statement
Given the head of a singly linked list, rearrange the nodes so that all nodes at odd indexes appear first, followed by all nodes at even indexes.
The first node in the list is considered at odd index 1, the second at even index 2, and so on.
Within the odd group and the even group, the relative order of the nodes must remain the same as in the original list.
Return the head of the reordered linked list.
Note: You must solve the problem in
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