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.
Added
use std::collections::HashSet;to the test module since it is needed for the provided solution.I found that a grid full of 5's will not work. Maybe there are other grid configurations that will give a false positive, but I still think this is not a bad approach.
Code without any pops or replaces, great for big arrays