@Doddy, This can be solved by a trivial solution something like -
a=0,b=0,c=1,d=1. The test suite will accept the solution, however, this is not something you want (only using non-zero integers as mentioned in the problem statement).
I have edited the test suite accordingly, and will do so wherever I face the same issue in the Number puzzle series.
Energy of a photon
Are all the three given point in the same line?
Check that number is whole number
Square root of a number
Draw a 'X'!
Number Puzzles - 017
Number Puzzle - 022
Number Puzzle - 032
Number Puzzle - 044
Number Puzzle - 075
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