Loading collection data...
Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Would be better if the description specified that the test cases are not expecting sub-domains (other than www). Most of the solutions here (including mine ;)) would fail on a URL like https://dev.example.com/.
description should say which approaches are not supported, like using BigInt is a very easy and valid solution here, but it's been disabled somehow.