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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.
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The description of the task doesn't mention that the lists are only comprised of numbers but the tests only check for numbers. Would be clearer if that was pointed out in the task.
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Well it is the normal way to do it in C (and the most efficient one), where working with strings is more difficult than plain numbers.
I wonder if this is more performant than the string-based solutions 🤔
It does seem easier to cover the different-bases case