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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.
How did your solution work in other compilers then? I think it should fail locally for you?
Closing as not a kata issue.
Does your solution work for matrices of size 1x1?
I cannot see your solution atm, but my guess would be you try to create a vector of size -1.