Join node values with arrows

Format string node values as 'a -> b -> c'; empty list returns ''.

linked-list lists pointers

Implement `format_linked(values: list) -> str` joining string payloads with `' -> '`.

Constraints

0 ≤ list lengths ≤ 10_000 unless noted.

Example

>>> format_linked(...)
# see tests

35 points ~30 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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