弹性碰撞

#include<iostream>
#include<math.h>
#include<algorithm>
#include<stdio.h>
using namespace std;
int N,H,R,T;
const double g=10.0;
double y[105];
double calc(int T)
{
    if(T<=0) return H;
    double t=sqrt(2*H/g);
    int k=(int)(T/t);
    if(k%2==0)
    {
        double d=T-k*t;
        return H-g*d*d/2;
    }
    else
    {
        double d=k*t+t-T;
        return H-g*d*d/2;
    }
}
int main()
{
    int round;
    cin>>round;
    while(round--)
    {
        cin>>N>>H>>R>>T;
        for(int i=0; i<N; i++)
        {
            y[i]=calc(T-i);
        }
        sort(y,y+N);
        for(int i=0; i<N; i++)
        {
            printf("%.2f%c",y[i]+2*R*i/100.0,i+1==N?‘\n‘:‘ ‘);
        }
    }
    return 0;
}