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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.
Since [1,4] overlaps [3,5] take the min and max, which is [1,5] that would give you 4 intervals and you add 3 intervals from [7,10] that would be 7 intervals in total. ✌
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well in this case i belive just summing operator "+" is most performance efficent.