What #include is min and max from?

[gavmcg92]

I'm writing a program that has a compare feature in it that allows me to check if one number is bigger than the other, less than or the same by returning -1, 1 and 0;
The piece of code that I have is

min(1, max(-1, b-a))

First off is this correct?

Secondly, what #include do I need to use if min and max are in my program?

[Texan40]

<algorithm>