why is some of the test cases hidden?

Question

some of the test cases are hidden for me. Is it because I do not have pro? or is it because I am on pc
here is my code please help fix it
https://code.sololearn.com/cVkJwsPW91C6/#py

Answer 1

You have to take input for the upper end of the range instead of using a fixed number.

Answer 2

No. They're locked for everyone.
https://www.sololearn.com/discuss/2450008/?ref=app
https://www.sololearn.com/discuss/2902698/?ref=app
https://www.sololearn.com/discuss/2662203/?ref=app
https://www.sololearn.com/discuss/2211081/?ref=app
https://www.sololearn.com/discuss/2207543/?ref=app
https://www.sololearn.com/discuss/2314301/?ref=app
https://www.sololearn.com/discuss/2889467/?ref=app
https://www.sololearn.com/discuss/2713859/?ref=app
https://www.sololearn.com/discuss/2129621/?ref=app
https://www.sololearn.com/discuss/2173418/?ref=app

Answer 3

These test cases are hidden for you to look for the bug that it is in your code.
that is part of learning

Answer 4

It's to make a good code that works with all the possible cases not just the shown cases