This is a submission for DEV Computer Science Challenge v24.06.12: One Byte Explainer.

Explainer

The recursive insight: split problems into simpler pieces. Sum 3 numbers by adding the 1st to the sum of the next 2. Divide & conquer the work then merge the parts. If you can solve the simplest, and you can make a problem simpler, you can solve anything.

Additional Context

TEAM: @dchaley @lynnlangit