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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.
Did you implement fib for negative inputs?I had also implemented O(log n) but I had forgotten to consider negative inputs and that made the function recur infinitely.
Either matrices or linear equations. If you want the hint clarified, look at this exercise: https://mitpress.mit.edu/sites/default/files/sicp/full-text/book/book-Z-H-11.html#%_thm_1.19
You need to achieve O(log(n))