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.
"global variable z" was explicitly mentioned in both the problem title and the problem description. Other than that, I trust that your comment and the Test Suite should be sufficient to remove any residual doubts.
Sum all integers from 1 to 2^n
Circular Primes (based on Project Euler, problem 35)
Coin Tossing: Probability of Same Heads for N tosses
Wheat on a chessboard pt 2
Elastic Collision 001: 1-D
Code breaker, Part II: Operation Orthos
The other half of the Fibonacci sequence
Seemingly impossible problem
Code breaker, Part III: Operation Xiangliu
What score did they give?
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