显然你用 `scanf` 读入浮点数时应该用 `"%lf"` 而不是 `"%d"`。
by ATZdhjeb @ 2023-07-27 18:21:21
还有 `scanf` 读入时要加取址符，也就是那句话要写成 `scanf("%lf",&s);`。
by ATZdhjeb @ 2023-07-27 18:22:35
`cin`and`<iostream>`：那我走？
by Zjc20120331 @ 2023-07-27 18:48:56
@[chenweizhen](/user/676569) （所有）楼上正解
by CSP_juruo @ 2023-07-27 18:51:41
@[ATZdhjeb](/user/483317) @[cut_subject_person](/user/500031) 谢谢二位大佬！
by chenweizhen @ 2023-07-27 18:53:08
@[ATZdhjeb](/user/483317) 可还是TLE?
by chenweizhen @ 2023-07-27 18:54:06
```
#include<cstdio>
#include<iostream>
#include<cmath>
using namespace std;
double n,cnt=2,ans=0;
int main()
{
cin>>n;
while(n>0)
{
n-=cnt;
cnt=cnt/100*98;
ans++;
}
cout<<ans<<endl;
return 0;
}
```
by tyy6034 @ 2023-07-27 19:00:42
@[chenweizhen](/user/676569) 循环那部分改成:
```cpp
double dis=0,k=2;
while(dis<s){
dis+=k;
k*=0.98;
ans++;
}
```
by CSP_juruo @ 2023-07-27 19:03:52
@[cut_subject_person](/user/500031) @[tyy6034](/user/917842) AC了谢谢！
by chenweizhen @ 2023-07-27 19:14:39