```cpp
#include<bits/stdc++.h>
using namespace std;
int n, m, ans, a[105][105];
int main() {
cin>>n>>m;
for(int i = 0; i < n; i++)
for(int j = 0; j < m; j++) {
int x;
cin>>x;
if(!i || !j || i == n - 1 || j == m - 1)
ans += x;
}
cout<<ans;
return 0;
}
```
by tder @ 2023-09-22 22:29:01
@[liyirong567](/user/955954)
by tder @ 2023-09-22 22:31:49
@[tder](/user/714254) 呃呃请教一下，她代码到底哪里错了
by Lele_S @ 2023-09-22 22:47:35
@[Lele_S](/user/757702) $1\times1$ 的矩阵会重复计算
by tder @ 2023-09-22 22:52:38
@[tder](/user/714254) 哦谢谢
by Lele_S @ 2023-09-22 22:54:06
@[Lele_S](/user/757702) qwq
by tder @ 2023-09-22 23:02:07