ZOJ 3923 In the Rain(数学)

#include<iostream>
#include<cstdio>
#include<cmath>
#include<functional>
#include<set>
#include <cstring>
#include <string>
#include <algorithm>
#include <cstdlib>
#include <queue>
#include <set>
#include <map>
#include <stack>
#include<cctype>
#include<sstream>
#include<vector>
#include <ctime>
using namespace std;
#define sp system("pause")
#define PI acos(-1.0)
typedef long long ll;
#define iin(x) scanf("%d",&x)
#define mst(x,y) memset(x,y,sizeof(x))
#define pr(x) printf("%.10f\n",x)

int main()
{
int t;
cin >> t;
while(t--)
{
double r,h,v,x0,dx,dy,dz;
cin >> r >> h >> v >> x0 >> dx >> dy >> dz;
dz = fabs(dz);dy = fabs(dy);
double tim = fabs(x0 / v);
v -= dx;
v=fabs(v);
//cout <<tim << endl;
double dxy = sqrt(v * v + dy * dy);
//cout <<v << endl;
//cout << h << " " << r << " " << tim << endl;
double sum = dxy * h * 2 * r * tim;
//pr(sum);
//dz = sqrt(dy * dy + dz * dz + v * v);
//sum += h * PI * r * r;
//pr(sum);
sum += dz * PI * r * r * tim;
//pr(sum);

printf("%.10f\n",sum);

}
return 0;
}