hdu 4438 Hunters（数学期望）

水题。

代码：

#include <iostream>#include <cstdio>#include <cstring>#include <cmath>#include <vector>using namespace std;#define LL long long#define eps 1e-6double X,Y,P,Q;int main(){int T;cin>>T;while(T--){scanf("%lf%lf%lf%lf",&X,&Y,&P,&Q);double t1=(X+Y)*P*Q+X*(1-Q);double t2=(X+Y)*P*(1-Q)+Y*Q;bool flag=0;double res;if(t1>t2-eps){flag=0;res=t1;}else {flag=1;res=t2;}if(flag)cout<<"wolf ";else cout<<"tiger ";printf("%.4f\n",res);}return 0;}