Remove duplicate values

Keep first occurrence of each value while preserving order.

linked-list lists pointers

Implement `dedupe_values(values: list) -> list` removing later duplicates while keeping first positions.

Constraints

0 ≤ list lengths ≤ 10_000 unless noted.

Example

>>> dedupe_values(...)
# see tests

22 points ~20 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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