hdoj2547

http://acm.hdu.edu.cn/showproblem.php?pid=2547

//水题#include <iostream>#include <cmath>using namespace std;double func(double x, double y, double m, double n){ return (sqrt(x*x + y*y + m*m + n*n - 2*m*x - 2*n*y));}int main(){ int t; double a, b, c, d; cin >> t; while (t--) {  cin >> a >> b >> c >> d;  printf("%.1lf\n", func((a+c)/2,(b+d)/2, a, b)+func((a+c)/2,(b+d)/2, c, d) ); } return 0;}