@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.
surface of a spherical planet
Rotate a Matrix by 90 degrees
Sophie Germain prime
Calculate distance travelled when given radius and rotations
Basic commands - Greatest common divisor
Number Puzzle - 103
Number Puzzle - 060
Number Puzzle - 073
Number Puzzle - 049
Temperature Conversion 2
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