Sum all node values

Add every integer payload in the list.

linked-list lists pointers

Implement `list_sum(values: list[int]) -> int` summing every integer node value in order.

Constraints

0 ≤ list lengths ≤ 10_000 unless noted.

Example

>>> list_sum(...)
# 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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