Test #4 is incorrect! (+)
It contains only one digit - and this digit is 0, so n=0, so what should I output? I've tryed '0', '0.25' ,..., '2', '3', '4', '5', '6', '10', '99', '100', 'No solution', 'No', 'no', '0%', '0.00', '-1'...
Nothing helps. What's wrong?