Solution: Odd Even Linked List
Understand how to rearrange a singly linked list by placing all nodes at odd indexes first, followed by even indexes while preserving their original order. This lesson guides you through an in-place solution with constant extra space and linear time complexity, helping you master efficient linked list manipulation.
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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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