Rearrange the equation to find one variable from another.
\$R = xX + yY\$
\$xX = R - yY\$
\$x = \frac{R - yY}{X}\$
I also wouldn't return -1, but would instead use None or an empty list. This is as -1 makes no logical sense.
And rather than extending a list with another list, just return the...
@stefan you're correct, I messed up the operator, it should have been a %, rather than a &. I also assume Python 3, or from __future__ import division.
Still you are returning float which may result in a TypeError.And you return negative x values as your loop runs up to R for no reason and you do not test for it (coefTargetSum(24, 5, 11)).
@stefan My code is purely for showing an alternate way to do something. It's rare to get a TypeError, but is adding int(...) that hard? So, the question doesn't say anything about results not being allowed to be negative.
If the task was not without negative numbers the search space would be infinite. You do limit the seach space to range(R), so you are accepting the non-negative-constraint. Just not fully.
at least i do expect an anser to be right. so no negative values. limit is one solution, testing would be an inefficient other one. and yes, when the answer is correctly passing test cases i do not argue about minor stuff.
There are no test cases provided. There's no domain provided either. I only use x % 1 == 0, because it looked like they were only looking for integers. IMO this is all minor stuff, as the big stuff was that the algorithm needed to change.
Discussion between stefan and Peilonrayz
Discussion between stefan and Peilonrayz