I see this #define EPS 1e-9 alot and Idk what EPS is? I searched it up but nothing useful related to this constant
Really? Just googled EPS 1e-9 And got plenty of results. Either way... EPS is just short for Epsilon - http://stackoverflow.com/questions/626924/what-does-eps-mean-in-c
it stands for the greek math symbol epsilon which is being used in this context as the smallest possible value for the (data, or data type, depending on context). Smaller values are considered to be zero.

C++ has a standard include with the ones for data types, numeric limits .h but I can't remember the exact spelling off the top of my head.

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