Initialize Filter3 Class

#include <iostream>
using namespace std;

// Define Filter3 class here

class Filter3 {
    int id;
    int coeff[3], lastOutput;

public:
    Filter3(int filterId, int c0, int c1, int c2){
              id = filterId;
              coeff[0] = c0;
              coeff[1] = c1;
              coeff[2] = c2;
              lastOutput = 0;
    }
    void apply (int x){
        lastOutput =  x * coeff[0] + coeff[1] + coeff[2]; 
    } 
    int read(){
        return lastOutput;
    }   

};

int main() {
    int id, c0, c1, c2;
    cin >> id >> c0 >> c1 >> c2;

    Filter3 f(id, c0, c1, c2);

    int s1, s2;
    cin >> s1 >> s2;

    f.apply(s1);
    f.apply(s2);

    cout << f.read();
    return 0;
}

Solving Approach