Coding Games and Programming Challenges to Code Better
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Created by @Lisa-Has-Ideas,validated by @Hawat_MH,@Eulero314 and @FredericLocquet.
If you have any issues, feel free to ping them.
Hi Lisa-Has-Ideas, I enjoyed doing your puzzle, but even if my code passes all the tests in the IDE, it fails at validators 3 and 4 after submission.
I cannot find what’s wrong with my code. How can I fix this without seeing the validators 3 and 4 ?
Thank you.
Thanks for playing my puzzle and thanks for the feedback.
Sorry for the trouble.
Do you want to send me your code, and I’ll have a look
And/or
I could send you one of those Validators.
It’s a challenge to solve this puzzle in O(1) space somplexity. Need some mathematical tricks to judge whether line x is a bookcase (horizontal platform) or not. 
At first I solved the puzzle using an array because it was the easiest approach, but then I read your comment and decided I should try without an array, and the solution came almost instantly, in fact if you spend a little more time on the puzzle and think carefully, the solution in O(1) space complexity is quite simple.