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Solution: Reorder List

Explore how to reorder a singly linked list efficiently by finding the middle node, reversing the second half, and merging the two halves alternately. This lesson helps you understand an optimized approach that uses constant space and linear time complexity for linked list manipulation.

Statement

Given the head of a singly linked list, reorder the list as if it were folded on itself. For example, if the list is represented as follows:

L0L_{0}L1L_{1}L2L_{2} → … → Ln2L_{n-2}Ln1L_{n-1} ...