#pragma once
template <class T>
struct DcCancelation
{
T x_n1;
T y_n1;
T R;
DcCancelation(T R) : R(R){};
T update(T x)
T y = x - this->x_n1 + this->R * this->y_n1;
this->x_n1 = x;
this->y_n1 = y;
return y;
};