I agree that solving them with pen and paper is bad ass. But many problems cannot be solved using brute force. They will give you one problem that can be solv

I agree that solving them with pen and paper is bad ass. But many problems cannot be solved using brute force. They will give you one problem that can be solved using brute force, then in a later problem they increase some n to the point where it cannot be solved using brute force. So it forces you to find a better solution.