ACCode:
```
#include<cstdio>
#include<cctype>
int n,a;char c;
const int& min(const int& a,const int& b)
{
return a<b?a:b;
}
int main()
{
while(c=getchar(),islower(c))
{
n++,a+=c=='a';
}
printf("%d",min(a*2-1,n));
return 0;
}
```
by Miller2019 @ 2020-07-27 17:32:15
帮帮这个刚进oi的萌新吧
by Miller2019 @ 2020-07-27 17:37:17
```cpp
#include<cstdio>
#include<cctype>
#include<iostream>
#include<unordered_set>
std::unordered_multiset<char>str;
using namespace std;
char c;
int main()
{
while(scanf("%c",&c),islower(c))
{
str.insert(c);
}
cout << std::min(str.size(),str.count('a')*2-1);
return 0;
}
```
by 数学课代表OvO @ 2020-07-27 17:42:47
0*2-1ull溢出?
by dead_X @ 2020-07-27 17:42:49
@[Miller2019](/user/256340) 不会用printf的时候用cout吧
by 数学课代表OvO @ 2020-07-27 17:43:24
@[dead_X](/user/111055) 取了min,不可能是因为这个
by 数学课代表OvO @ 2020-07-27 17:47:22
@[dead_X](/user/111055) 而且 count 返回值是 difference_type 是个有符号整数吧
by 数学课代表OvO @ 2020-07-27 17:49:36
@[数学课代表OvO](/user/326595) 那为什么ide会t
by Miller2019 @ 2020-07-27 17:51:15
@[Miller2019](/user/256340) 我猜你没在输入结束处打换行符
by 数学课代表OvO @ 2020-07-27 17:52:21
@[数学课代表OvO](/user/326595) 啊这，我一直以为scanf返回EOF时也会给字符赋值为EOF。。。
by Miller2019 @ 2020-07-27 17:55:42