I finally understood your problem. The problem description needs some adjustment. It is not clear that it is requesting only the global variable named 'z'. I thought it was referring to every global variable.
Find the palindrome
So many choices
the fly, the train, the second train, and their Zeno's paradox
Snakes on a plane
Compute a dot product of two vectors x and y
Testing for randomness: uniform distribution of real numbers (distribution checking)
Wait a second!
Testing for randomness: uniform distribution of integers
Make your own Test Suite (part 1)
Code breaker, Part I: Operation Phoenix
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