ural 1192 Ball in a Dream

 1 #include <cstdio>

 2 #include <cstring>

 3 #include <cmath>

 4 #include <algorithm>

 5 #define maxn 2000

 6 using namespace std;

 7 const double pi=acos(-1.0);

 8 

 9 

10 int main()

11 {

12     double v,a,k;

13     scanf("%lf%lf%lf",&v,&a,&k);

14     double ans=0;

15     a=a*pi/180;

16     while(1)

17     {

18         if(v<0.01) break;

19         ans+=(2*v*cos(a)*v*sin(a))/10.0;

20         double ek=0.5*v*v;

21         ek=ek/k;

22         v=sqrt(ek*2.0);

23     }

24     printf("%.2lf\n",ans);

25     return 0;

26 }

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