UVA 11314 - Hardly Hard（数论）

#include <stdio.h>
#include <string.h>
#include <math.h>

int t;
struct Point {
	double x, y;
	Point() {}
	Point(double _x, double _y) {
		x = _x; y = _y;
	}
	void scan() {
		scanf("%lf%lf", &x, &y);
	}
} a, b, c, d;

double dis(Point a, Point b) {
	double x = a.x - b.x;
	double y = a.y - b.y;
	return sqrt(x * x + y * y);
}

int main() {
	scanf("%d", &t);
	while (t--) {
		a.scan();
		b.scan();
		c = Point(-b.x, b.y);
		d = Point(a.x, -a.y);
		printf("%.3lf\n", dis(a, b) + dis(c, d));
	}
	return 0;
}