和蚂蚁问题类似。

#include<cstdio>
#include<cstring>
#include<cmath>
#include<vector>
#include<queue>
#include<algorithm>
using namespace std; int c,n;
double h,r,t,T;
double ans[]; double cal(double time)
{
if(time<=) return h;
int f=;
while()
{
if(time<=T)
{
if(f==) return h-0.5*10.0*time*time;
return h-0.5*10.0*(T-time)*(T-time);
}
f=f^;
time=time-T;
}
} int main()
{
scanf("%d",&c);
while(c--)
{
scanf("%d%lf%lf%lf",&n,&h,&r,&t);
T=sqrt(*h/10.0);
for(int i=;i<n;i++) ans[i]=cal(1.0*t-1.0*i);
sort(ans,ans+n);
for(int i=;i<n;i++) ans[i]=ans[i]+2.0*r*i/;
for(int i=;i<n;i++)
{
printf("%.2lf",ans[i]);
if(i<n-) printf(" ");
else printf("\n");
}
}
return ;
}

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