@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.
First N Perfect Squares
What's Your BMI?
Matlab Basics - Rounding III
Number Puzzles - 020
Perimeter of a quadrilateral
Number Puzzle - 042
Matrix Pattern 8
Number Puzzle - 074
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