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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.
This solution does not actually pass the tests...
As mentioned, it should take into account the case where the ball bounces at the exact height of the window.
It would have been nice if it worked like this.
And I think that (int)floor() is redundant.
In this test, you should have the char 255 at some point in the input.
Then 255+1 = 0, and it breaks the loop.