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.
Using numbers instead of characters, e.g. 97 instead of 'a' makes any code significantly less readable.
This comment is hidden because it contains spoiler information about the solution
For only one type of brackets using stack is kind of an overkill.