题目描述

blablabla

样例

blablabla

#include<iostream>
#include<cmath>
using namespace std;
#define PI acos(-1)
int main() {
    int T;
    cin>>T;
    for (int C=1;C<=T;C++) {
        double v,d;
        cin>>v>>d;
        double g=9.8;
        double l=0,r=45;
        while (r-l>1e-7) {
            double mid=(l+r)/2;
            if (v*v*sin(2*mid/180 * PI)/g>=d) r=mid;
            else l=mid;

        }
        printf("Case #%d: %.8lf\n", C, r);
    }
    return 0;
}