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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.
I really like your solution.
A slight optimization would be to break or return -1 when temp_m exceeds m since all folowing temp_m values will be bigger then m too.
First time seeing the prepended ++ operator used.
I think using a seperate (nested) class for your list item would improve readability dramatically.