Thanks, I figured it out

iirc, it's canvas-like coordinates:

0 --> x

|
v

y

Can someone explain how coordinates are chosen? Examples and their points seem contradictory with each other.

spent 1.5 hours only to get a timeout

it's certainly too hard for 4kyu

Yep I checked on tests and it throws timed out if number exceeds 100m. FYI, creating an array of all possible combinations is not a good solution.

I get timed out on bigger numbers. Is it possible that my code is too slow?