hdu2438_三分

超级无敌神题,此题到现在为止还不知自己写的错在哪里

 

#include<iostream>#include<cstdio>#include<cmath>using namespace std;double x,y,l,w;const double pi=acos(-1.0);double cal(double a){double b,c,d;b=w/sin(a)+l*cos(a);c=l*sin(a)+w/cos(a)-x;d=l*sin(a)+w/cos(a);return c*b/d;}int main(){while(scanf("%lf%lf%lf%lf",&x,&y,&l,&w)!=EOF){double left=0.0,right=pi/2.0,m,mm;while(left+1e-4<right){m=(left+right)/2.0;mm=(left+m)/2.0;if(cal(m)>cal(mm))left=mm;elseright=m;}/*while(left+1e-4<right) //自己写的,不知错在哪里{m=(left+right)/2.0;mm=(right+m)/2.0;if(cal(m)>cal(mm))right=mm;elseleft=m;}*/if(cal(left)<y)printf("yes/n");elseprintf("no/n");}return 0;}