题解 | #点的距离#

#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
class CPoint {
private:
    int x, y;
public:
    CPoint(int x, int y) : x(x), y(y) {}
    float operator-(const CPoint &other) const {
        return sqrt(pow(x - other.x, 2) + pow(y - other.y, 2));
    }
};
int main() {
    int m;
    cin >> m;
    while (m--) {
        int x1, y1, x2, y2;
        cin >> x1 >> y1 >> x2 >> y2;
        CPoint p1(x1, y1), p2(x2, y2);
        cout << fixed << setprecision(2) << p1 - p2 << endl;
    }
    return 0;
}