This was a fun problem, but I think lookup table solutions are possible given the way the way the test suite is configured. Maybe you could add a string parser to see if the test suite correct solutions are included in the answer code?
Connect Four Win Checker
Project Euler: Problem 9, Pythagorean numbers
Find a subset that divides the vector into equal halves
Van Eck's Sequence's nth member
Sorting integers by their digits (Level 3)
Mean number of letters per word (Easy)
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