推公式，r′=dr/dt=vy=v22−v12r2/R2−−−−−−−−−−−−√,可得积分公式为
∫R0y=1/v22−v12x2/R2−−−−−−−−−−−−−√，利用三角换元去化简就可以
代码：
#include <cstdio>
#include <cstring>
#include <cmath>
typedef long long ll;
int t;
double v1, v2, r, d;
int main() {
scanf("%d", &t);
while (t--) {
scanf("%lf%lf%lf%lf", &v1, &v2, &r, &d);
double ti = asin(r * v1 / r / v2) * r / v1 - asin(0.0) * r / v1;
if (ti * v2 > d) printf("Why give up treatment\n");
else printf("Wake up to code\n");
}
return 0;
}