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The problem is not a big deal, but watch out that you use a good pi value.
I used 3.14159 from memory, but it was not good enough.

Pi is in math.h, and on MS compilers its ifdef'd out.
here it is: 3.14159265358979323846, u can borrow it

Maybe best to copy & paste it to a variable on such platforms as the required #define is not standard C++ & may give compile errors on the Judge.

good luck

yoshiro aoki wrote:Maybe best to copy & paste it to a variable on such platforms as the required #define is not standard C++ & may give compile errors on the Judge.

I dont understand what are you saying. You can use And this works perfectly. And there is one multiplication. So, you can store it in a variable. You have to include math.h for the acos() function. Thats all.

Im sorry that you cannot understand it, but I cannot make it more clear than what I have already said. I hope someone else may be able to help you.

have a good day