Solution: Odd Even Linked List
Explore how to rearrange nodes in a singly linked list so that all odd-indexed nodes come first, followed by even-indexed nodes while preserving their order. Understand the in-place algorithm using pointer manipulation to achieve O(n) time and constant space complexity, enabling 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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