Initialize Filter3 Class

#include <iostream>
using namespace std;

// Define Filter3 class here
class Filter3 {
private:
    const int id;
    int coeff[3];
    int lastOutput;

public:
    Filter3(int filterId, int c0, int c1, int c2) 
        : id(filterId), coeff{c0, c1, 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;
}