@[ht20110603](/user/731726) 求关注
```cpp
#include <bits/stdc++.h>
using namespace std;
int main()
{
double x;
cin >> x;
cout << ceil(log(1 - x / 100) / log(0.98));
return 0;
}
```
by JustinXiaoJunyang @ 2022-08-02 17:04:51
```b-a;```
$\downarrow$
```b-=a;```
by ajahjahah @ 2022-08-02 17:04:52
@[ht20110603](/user/731726) `b-a;`这个语法没什么意义，只不过是算了一个值，然后就没动静了，如果想把这个值传递给b的话那么有两种写法：`b=b-a;`和`b-=a`两种语法代表同一个意思，
by ShouZheng_Observer @ 2022-08-02 17:20:03
@[PhantomKnight](/user/681349)
改了全WA？？？
by ht20110603 @ 2022-08-02 17:34:03
@[ht20110603](/user/731726) 啊……那我再看看哈
by ShouZheng_Observer @ 2022-08-02 17:37:18
```cpp
#include<bits/stdc++.h>
using namespace std;
int main(){
double n,a=2,b=0,su=0;
cin>>n;
b=n;
for(int i=0;i<n;i++){
if(b>0){
su++;
b-=a;
a*=0.98;
}
}
cout<<su;
return 0;
}
```
这样的话是80分
by ShouZheng_Observer @ 2022-08-02 17:44:58
使用while循环就可以了
by Syncc @ 2022-08-15 13:15:28