Here you sort ALL the 50 millions element and after you had to compare the digit (not linear for sur).

But all you have to do is to look element by element and find the first one who is not asc (linear).

Sorry for my english

Probably it's the most fastet solution. Can you explain please why do you think that this solution is slow?

test on a list of len 50 millions

your decision took time: 2.390636682510376

supposedly slow decision took time: 1661070264.348622

your decision longer on 1.7343978881835938

weird how you got dislikes. i even had 7kyu challenges that are harder than this one. 6kyu - 7kyu sounds more accurate.
note even sure why some people struggle with this one because its really straight forward (no mathematical trick, no algorithmic trick, no performance issues).
maybe some people dont know how to play sudokus and have a hard time understanding this problem.

Maybe not that faster but definitely less memory-expensive!

Yeah you're right, I didn't think about that at first and I submitted a solution that uses len instead of count later on

Naming variables correctly is the most difficult task in a programmer life

A-well-a everybody's heard about the bird!
B-Bird bird bird, bird is the word
:-)

I don't think it's a good idea, the description says nothing about empty lines, leading spaces, etc. I think the original state of mind behind this kata was simply not to fool users with implausible cases, like this. However, this kata is now old and has been completed more than 30 k times, its design won't be changed.

I apologize!

No problem but why did you downvote my post? I looked at the description and saw nothing about "extremely big tests", I didn't look at the tests themselves... I will change these names.

Since "extremely big number"...

Did I promise that? Not everybody is as smart as you are:-) Anyway it is too late to change tests when so many people passed the kata.

Understood when I saw your first solution. Added a test.

I don't understand your post. Please could you be clearer, maybe with an example?

Tests let pass wrong solutions

Any example?