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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.
TLDR: this Kata description is WRONG. The test cases are checking for longest unique string characters that are a combination of BOTH strings.
I had the same issue. the 1214 population one. Should be 3 years.
Edit: I think we are supposed to not allow float rounding up. I did the calcs by hand and if you use int on population increases it checks out
Fun kata, feels more like a 6 kata, spent 1.5 hours on this lol.