Hi everyone,

I'm trying to solve this problem.

But my program gives wrong answer for this test case:

```
1
3 85
33 7 85
```

cause of the error is because normally

`ceil(( 100.00 / 85.00 ) * 85.00 ) = 100`

but my program returns answer as 101.

I guess its because CPP can't find exact result of ( 100 / 85 ) so it returns ( 100.00 / 85.00 ) * 85.00 ) something like 100.000001 and ceil function rounds the number up.

Is there a way to fix this?

Thanks in advance.

You should probably read this.

TLDR: You should never use

`floor()`

or`ceil()`

in c++ if you're dealing with integers. And in fact you should never use any floating-point numbers if you're only dealing with integers.In order to calculate

`ceil(a / b)`

for integers, do`(a + b - 1) / b`

, but be careful with negative numbers as the behaviour may be unexpected.It seems that in your case, you might need to rewrite your calculations a little bit before you can get this to work.

Thanks a lot, I got AC now.