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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.
You will like https://www.codewars.com/kata/52bb6539a4cf1b12d90005b7 this kata then :) // It's battleship field validator.
Tried to find your solution, but unsuccessfully.
This is a completely different thinking! Thank you for making my evening : )