```cpp
#include <stdio.h>
#include <iostream>
using namespace std;
int main() {
double a, b, c = 7, s = 0;
scanf("%llf%llf", &a, &b);
while (1)
{
if (s >= a - b)
{
if (c * 0.98 >= 2 * b)<- 这里
{
puts("n");
}
else
puts("y");
return 0;
}
s += c;
c *= 0.98;
}
return 0;
}
```
by _Clown__ @ 2023-11-08 17:02:42
@[IOI_ILJYT](/user/902351)
by _Clown__ @ 2023-11-08 17:02:53
@[ng_bf](/user/593499) WA了
by IOI_ILJYT @ 2023-11-08 17:09:44
输入llf改成lf试试 @[IOI_ILJYT](/user/902351)
by _Clown__ @ 2023-11-08 17:11:25
@[ng_bf](/user/593499) 我改了输入就行了：
```cpp
#include <stdio.h>
#include <iostream>
using namespace std;
int main() {
double a, b, c = 7, s = 0;
cin >>a >> b;
while (1)
{
if (s >= a - b)
{
s += c;
if (s > a + b)
{
puts("n");
}
else
puts("y");
return 0;
}
s += c;
c *= 0.98;
}
return 0;
}
```
but,thx
by IOI_ILJYT @ 2023-11-08 17:12:13