FZU 2095 水面高度

一共六种情况。手算即可。

#include<cstdio>
#include<cstring>
#include<cmath>int T;
double a,b,c,d,x;
double ans;int main()
{scanf("%d",&T);while(T--){scanf("%lf%lf%lf%lf%lf",&a,&b,&c,&d,&x);double h=sqrt(c*c-x*x*c*c/(a*a));double p=x*c/a;double tmp=a*d;if(x<=h){double m=a*a/sqrt(a*a-x*x);double s1=m*x/2;double s2=a*c-m*x;double s3=m*x/2;if(tmp<=s1) ans=sqrt(tmp/s1)*x;else if(tmp<=s1+s2) ans=(tmp-s1+m*x)/m;else ans=x+h-sqrt((a*c-tmp)/s1)*x;}else{double m=c*c/p;double s1=m*h/2;double s2=a*c-m*h;double s3=m*h/2;if(tmp<=s1) ans=sqrt(tmp/s1)*h;else if(tmp<=s1+s2) ans=(tmp-s1+m*h)/m;else ans=h+x-sqrt((a*c-tmp)/s1)*h;}printf("%.2lf\n",ans);}return 0;
}