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#include<cstdio>#include<cmath>using namespace std;const double pi = acos(-1.0);int main(){int d,h,v,e;scanf("%d%d%d%d",&d,&h,&v,&e);double s = pi * d * d / 4;double sv = v / s;if(sv <= e){puts("NO");return 0;}double t = h / (sv - e) ;printf("YES\n%.6lf\n",t);return 0;}
[2016-05-01][codeforces][667A - Pouring Rain]
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原文地址:http://www.cnblogs.com/qhy285571052/p/99068646c72454af613ba7287d876bf2.html