Use PI with at least 3 precision numbers, i.e. 3.141... That was my mistake

Thanks for good advice. Now I got AC.

Is there any defined costant for pi in c/с++?
M_PI from math.h works correctly on my computer, but judge's compiler doesn't know it.

Edited by author 13.03.2012 13:18

I use this:

const double PI = acos(-1.);