前面是 $0\sim n-1$ 和 $0\sim m-1$，后面又变成了 $1\sim n$ 和 $1\sim m$
by tder @ 2023-11-05 11:54:49
@[tlljh120](/user/1056503)
by tder @ 2023-11-05 11:55:27
谢谢大佬
by tlljh120 @ 2023-11-05 12:04:22
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_~~****- 1. ```
#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
int m,n,he=0,x;
int main(){
cin>>m>>n;
for(int i=0;i<m;i++){
for(int j=0;j<n;j++){
cin>>x;
if(i==0 || i==m-1 || j==0 || j==n-1){
he+=x;
}
}
}
cout<<he;
return 0;
}
```
****~~_
by xujinling @ 2023-11-16 19:58:55