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20 lines
406 B
C++
20 lines
406 B
C++
#include <cstdio>
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#include <cmath>
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const double pi=acos(-1);
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int main()
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{
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double R,r,H,S;
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int F;
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while(scanf("%lf%lf%lf%d%lf",&R,&r,&H,&F,&S)!=EOF)
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{
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double h=H/F,dr=(R-r)/F,ans=0;
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for(int i=0; i<F; i++,r+=dr)
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{
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int n=pi/atan(S/2/h/r);
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ans+=2*r*tan(pi/n)*n*h;
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}
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printf("%.3lf\n",ans);
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}
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return 0;
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}
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