知识点：运算 

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

int main() {
    int x1 = 0;
    int y1 = 0;
    int x2 = 0;
    int y2 = 0;
    int result = 0;

    cin >> x1 >> y1;
    cin >> x2 >> y2;

    result = pow((x1 - x2), 2) + pow((y1 - y2), 2);

    cout << result;

    return 0;
}