Hello guys i hope y'all fine. i found that i am so bad on problems which need "lexicographically smallest string" anyone knows how to train for such this problems cuz i started with B on today's contest i tried a lot but did not solve it , or even get close.. i saw solutions know and it is like WTF it is ez , anyone can help PLZ,.**

Local test cases testing

Hello guys i used to watch neal's youtube videos , and i found that he has some kind of scripts that he uses to test his solution, i think this script is using the API of the website and find the running contest and you choose the current problem so it takes the solution and run it on the cases and tells you how many tests u passes , and fails. _____-
so as a linux user i am asking if anyone has any idea about this script or should i write my own :> thanks.