rastojanje tacaka

#include <iostream>
#include <iomanip>
using namespace std;

int main() {

    double ax, ay, bx, by;
    cin >> ax;
    cin >> ay;
    cin >> bx;
    cin >> by;

    double x = abs(ax - bx);
    double y = abs(ay - by);

    double r1 = pow(x, 2) + pow(y, 2);
    double r = sqrt(r1);

    cout << fixed << setprecision(5) << r;

    return 0;
}