Got it, I had to get my code to make a guess on the medium difficulty puzzle as the strategies I used didn't give me all the way. There's actually an issue with my code in that if it doesn't guess correctly the program will break. Should probably fix that and do a massive refactor as 700+ lines of code is wayyyy too much. On the plus side time was never an issue for me so didn't have to optimze at all.

You shouldn't get any.

That is the hardest thing I've done. Can't believe that I finished it.

You should add "(1 - 2) + -(-(-4))" to the final tests as it's possible to pass this Kata without dealing with brackets that need to be flipped odd times.

Description:
You have been asked to work out the area of number of rectangles.

The input to your function is a array of longs. If the arrays length is odd you should return void. Otherwise you should use adjacent pairs of longs to calculate the area.

For example if the input is {4,4,5,5,6,6,7,7} you should return {16, 25, 36, 49}.

the solution may be better , bc it is easy to read.

This has a lot of reapeating code that could be put into an extra method. Especially the switch case blocks can be easily replaced by a single method with only one of them.