code：

#include <bits/stdc++.h>
using namespace std;
int a[110][110], n[110][110];
int main()
{
    int b, c;
    cin >> b >> c;
    for (int i = 1; i <= b; i++)
    {
        for (int j = 1; j <= c; j++)
        {
            cin >> a[i][j];
            n[i][j] = a[i][j];
        }
    }
    for (int i = 1; i <= b; i++)
    {
        for (int j = 1; j <= c; j++)
        {
            if (!(i == 1 | i == b | j == 1 | j == c))
            {
                n[i][j] == round((a[i - 1][j] + a[i + 1][j] + a[i][j + 1] + a[i][j - 1] + a[i][j]) / 5.0);
            }
        }
    }
    for (int i = 1; i <= b; i++)
    {
        for (int j = 1; j <= c; j++)
        {
            cout << n[i][j] << " ";
        }
        cout << endl;
    }
    return 0;
}