Please help me in code coach problem: paint cost

Question

https://code.sololearn.com/cGM7GMdyT010/?ref=app

Answer 1

Buying an odd amount of colours will fail because integer division/ storing the result in an integer will cut off the .5 part, e.g.

1 -> 45 / 10 = 4
3 -> 55 / 10 = 5

so rounding it afterwards has no effect. Also, I would prefer std::ceil() over std::rint() when it comes to rounding a number up.

Answer 2

Thanks @Shadow