mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
41 lines
760 B
C++
41 lines
760 B
C++
|
#include <iostream>
|
||
|
|
#include <cstring>
|
||
|
|
#include <cstdio>
|
||
|
|
#include <cmath>
|
||
|
|
using namespace std;
|
||
|
|
const double pi=acos(-1.0);
|
||
|
|
const double g=9.8;
|
||
|
|
double v,h;
|
||
|
|
double ans(double a)
|
||
|
|
{
|
||
|
|
double a1=v*v*sin(a)*sin(a);
|
||
|
|
double a2=2*g*h;
|
||
|
|
a1=a1+a2;
|
||
|
|
a1=sqrt(a1);
|
||
|
|
a1=a1/g;
|
||
|
|
a1=a1+v*sin(a)/g;
|
||
|
|
a1=a1*v*cos(a);
|
||
|
|
return a1;
|
||
|
|
}
|
||
|
|
int main()
|
||
|
|
{
|
||
|
|
int T;
|
||
|
|
scanf("%d",&T);
|
||
|
|
while (T--)
|
||
|
|
{
|
||
|
|
scanf("%lf%lf",&h,&v);
|
||
|
|
double l=0;
|
||
|
|
double r=pi/2;
|
||
|
|
while (r-l>=0.0000001)
|
||
|
|
{
|
||
|
|
double m=(l+r)/2;
|
||
|
|
double mm=(m+r)/2;
|
||
|
|
if (ans(m)<ans(mm))
|
||
|
|
l=m;
|
||
|
|
else
|
||
|
|
r=mm;
|
||
|
|
}
|
||
|
|
printf("%.2f\n",ans(l));
|
||
|
|
}
|
||
|
|
}
|