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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.
Add a print statement to your code so you can check the log and see the intervals being tested in the random tests.
Debug your solution. See https://docs.codewars.com/training/troubleshooting#test-attempt
Closing as this is not a valid kata issue report. See https://docs.codewars.com/training/troubleshooting#post-discourse
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.