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Solution: Odd Even Linked List

Explore how to rearrange a singly linked list so that nodes with odd indices appear before even indices while preserving their original order, using an efficient in-place algorithm. Understand how to traverse and reconnect nodes with just constant extra space and linear time complexity.

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  ...