Oops ok I got it. I was only adding numbers that were next to each other. Turns out its the largest sum of ANY pair.

Is it just me, or are the random test cases broken? I am literally going through the input manually with a calculator and I cant find a single pair of numbers that matches the expected output.

i felt so dumb but i realize that sensei is just bullying us
i will not forget the dummiest keyword i have been confused on is pair :D

dear reader if you still stack in this problem come and join me by ^

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random tests
Falsifiable (after 3 tests and 3 shrinks):
  1
  0
  [1] expected 2 but got 1

I think haskell random tests are a bit flaky, I constantly get weird results like [1,-1] expected 1 bu got 0, [0] expected -1 bu got 0 et cetera...

approved

Haskell translation

Approved

fixed the random tests

C translation (author gone)

approved

COBOL translation (author inactive).