Middle node index

Return the floor middle index for a non-empty list.

linked-list lists pointers

Implement `middle_index(values: list) -> int | None` using floor(len/2); return `None` when empty.

Constraints

0 ≤ list lengths ≤ 10_000 unless noted.

Example

>>> middle_index(...)
# see tests

10 points ~12 min

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Hints

Work on paper with a tiny list first.

Match the function signature exactly.

Test Results

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