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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.
Wait. The "SOS" code was actually written in the challenge description. I feel really stupid now!
std::vector< std::vector< int > > combinations;
This can be a memory hog in larger projects. Thankfully we don't need to store these roads for future. :)