Yeah, it was my blunder. I didn't notice the information about starting from the left. Pardon.

Output of my Scala refsol matches output of authors original refsol in Python. Being unable to read the description is not an issue.

It appears to me that the Scala solution is correct.

For Seq("B", "B", "A", "A", "A", "B", "A") I would expect:

• Pop "B", "B" from index 0 => Seq("A", "A", "A", "B", "A")
• Pop "A", "A", "A" from index 0 => Seq("B", "A")
• Nothing more to pop; return Seq("B", "A")

when I test the reference solution popBlocks(Seq("B", "B", "A", "A", "A", "B", "A")) => Seq("B", "A")

Do you expect something different? If so, what?

pop starting from the left. ¯\(ツ)/¯

yeah, I am talking about Scala version

Just for completeness: you mean Scala tests, right?

I get the impression that solutions don't pass this use case Seq("B", "B", "A", "A", "A", "B", "A").
Moreover, the approved solution https://www.codewars.com/kumite/6538b31317466215f3a3ccdf?sel=6538b31317466215f3a3ccdf as well :(