Concatenate two linked lists

Append the second list's nodes after the first and return a new list.

linked-list lists pointers

Implement `concat_lists(a: list, b: list) -> list` returning `a` followed by `b` in a new list.

Constraints

0 ≤ list lengths ≤ 10_000 unless noted.

Example

>>> concat_lists(...)
# 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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