1438：灯泡

最新推荐文章于 2022-09-19 18:59:16 发布

后天Tomorrow

最新推荐文章于 2022-09-19 18:59:16 发布

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本文链接：https://blog.youkuaiyun.com/qq_42552468/article/details/97031523

#include<iostream>
#include<cstdio>
using namespace std;
double h1,h2,d;
double cal(double x)
{
   double a=h2*x/(h1-h2);
   if(a+x<=d)return a;
   else
   {
       double y=d-x;
       double t=a-y;
       double tmp=h1/(x+a);
       double s=tmp*t;
       return y+s;
   }
}
int main()
{
   int T;
   scanf("%d",&T);
   while(T--)
   {
       double l,r;
       scanf("%lf%lf%lf",&h1,&h2,&d);
       l=0;
       r=d;
       while(r-l>1e-6)
       {
           double m1=l+(r-l)/3;
           double m2=r-(r-l)/3;
           if(cal(m1)>cal(m2))r=m2;
           else l=m1;
       }
       printf("%.3lf\n",cal(l));
   }
   return 0;
}