When the input is certainly not the global variable z, your function must return false. Otherwise return true. All inputs & variable values will be scalar.
Reverse Run-Length Encoder
Find best placement for ordered dominoes (harder)
Split a string into chunks of specified length
Coin Tossing: Probability of Same Heads for N tosses
Code breaker, Part II: Operation Orthos
Make your own Test Suite (part 3)
The twelve days of Christmas
Testing for randomness: uniform distribution of real numbers (distribution checking)
Code breaker, Part III: Operation Xiangliu
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