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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.
That means that something threw an error, which means your code is not working correctly.
he is adding on the w ( the sum ) the difference of the two elements. Because the second one has a "-" before it, it means the negative value of the secondary diagonal is stored.
In the end he then just can compare whether w < 0 ( secondary wins ) or w > 0 ( primary wins ). Pretty cool.
http://lmgtfy.com/?q=SIGFPE