cvad

#include <iostream>

using namespace std;

​

​

int main()

{

​

    double x, y;

    cout << "Input x\n";

    cin >> x;

    cout << "Input y\n";

    cin >> y;

    double a = 4-2*x;

    double b = -5+2*x+y;

    double c = -1-y;

    if ((x>=0&&x<=2&&y>=-1&&y<=1)||(a >= 0 && b >= 0 && c >= 0)||(a <= 0 && b <= 0 && c <= 0))

    {

        cout << "yes";

    }

    else

    {

        cout << "no";

    }

}