If the stations are arranged next to each other, in positions [0, 1, 2, 3] is [1, 2, 3, 4] a valid conveyor belt configuration?

hm. not sure how we can change the leveling after a kata is accepted.

invalidated due to additional stress test

well done. I think this is the first I've seen with this approach in O(n) time

ooh good catch. that only killed one solution which does indeed have an inner loop:
https://www.codewars.com/kata/reviews/645e79dbbdccc80001144e52/groups/645ff9953cd4400001de1e26

technically it is still the same, just that more of it is visible :D

but ig this requirement doesn't make the solutions much more interesting. so we can kill it.

k. I'll add more perf tests

added smaller ones

oh wait I can see your code.

your solution only looks at the beginning of the string.

so something like this would return True.

<>....<>
<>....><

this should be false because the last two trains pass each other.

expected time complexity

ooh that'll work. thanks

I'd be curious to see those test cases once you have them.

clean code. I like it.

I can break it tho. this is what I get for not writing comprehensive tests -_-

say some trains shall move back slightly. then others move forward as god intended. then adl > bdl. then the case is marked valid.

before: ".>>...."
after:  ">.....>"

kk

fixed

resolved