@[summer_flower](/user/963497)
AC代码：
```cpp
#include<iostream>
using namespace std;
int main()
{
int a, b, f;
int i, j;
char ch;
cin >> a >> b >> ch >> f;
for(i = 1; i <= b; i++)//第零行
{
cout << ch;
}
cout << endl;
for(i = 1; i <= a - 2; i++)
{
cout << ch;
for(j = 1; j <= b - 2; j ++)
{
if(f == 0)
{
cout << " ";
}
else
{
cout << ch;
}
}
cout << ch << endl;
}
for(i = 1; i <= b; i++)//最后一行
{
cout << ch;
}
}
```
by 1_1_1_1_1_1_ @ 2023-05-13 19:55:26