@[AC_kkk0926](/user/1236984)
```cpp
#include<bits/stdc++.h>
using namespace std;
float now = 7 , l , r , s , x , sum;
int main()
{
scanf ("%f %f" , &s , &x);
l = s - x;
r = s + x;
while (sum < l)
{
sum += now;
now *= 0.98;
}
now *= 0.98;
if (sum + now > r)
{
cout << "n";
return 0;
}
printf ("y");
return 0;
}
```
by Y_QWQ_Y @ 2024-01-23 11:09:32