1-5.cpp

#include<bits/stdc++.h>
using namespace std;
int a[105][105];
int main()
{
    int t;
    cin >> t;
    while (t--)
    {
        int n;
        cin >> n;
        for (int i = 1; i <= n; i++)
            for (int j = 1; j <= n; j++)
            {
                char x;
                cin >> x;
                a[i][j] = x - '0';
            }
        int ans = 0;
        for (int i = 1; i <= (n + 1) / 2; i++)
        {
            for (int j = 1; j <= n / 2; j++)
            {
                int x = a[i][j] + a[j][n - i + 1] + a[n - i + 1][n - j + 1] + a[n - j + 1][i];
                ans += min(4 - x, x);
            }
        }
        cout << ans << endl;
    }
    return 0;
}