Thanks for your comments, I fixed it.

specifically for the reason you just gave: sum of nothing == 0 ;)

Python translation

Python translation

I tried but it didn't work before. I don't know why. I fixed it.

Еhank you for your help and advice.

Replace int arr[] with vector notice that int size is redundant. Done
Replace C headers with proper ones time.h should be ctime either random Done
I suggest to provide the helper ExtraMessage("Wrong answer for arr={4, -1, -2}") method. Done
using namespace std is used now Done

Python translation

You must update the description

And who will write the decision?
The error occurs if you stupidly click on the Attempt button!

Rust (attempt tests only):

error[E0599]: no method named `tuple_windows` found for struct `Map` in the current scope
  --> src/lib.rs:35:10
   |
35 |         .tuple_windows::<(_, _)>()
   |          ^^^^^^^^^^^^^ method not found in `Map<Filter<Enumerate<std::slice::Iter<'_, i32>>, [closure@src/lib.rs:33:17: 33:25]>, [closure@src/lib.rs:34:14: 34:22]>`

I can't fix it, I haven't studied Rust. I'll ask the translator to fix it.

Done.