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.
There're already many katas about finding duplicates/pairs-of-elements/whatever in linear time.
Duplicate to at least 10 ;p
Needs random tests
Passing in
youandexitis a bit redundant, isn't it? They're in the map already.This comment is hidden because it contains spoiler information about the solution