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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.
The reference solution returns
"100.246.254.253". Unless you're modifying the input, your code is wrong."100.246.254.253" is the right answer indeed. That's weird. I've just solved this kata in c++ and had no problem. Is it a permanent problem?
Not an issue of the kata. Unfortunately your code seems wrong.