import java.util.*;
public class Main{
    static int N=110;
    static int [][]w=new int [N][N];
    static int n;
    static int m;
    //用坐标和与坐标的积 来表示 坐标是否重复
    static int getSum(int x,int y){
        return x*y+x+y;
    }
    static long calc(List<int[]>in){
        List<Integer>list=new ArrayList();
        for(int[]t:in){
            list.add(w[t[0]][t[1]]);
        }
        Collections.sort(list);
        long res=0;
        for(int x:list){
            res+=Math.abs(x-list.get(list.size()/2));
        }
        return res;
    }
    public static void main(String[]args){
        Scanner sc=new Scanner(System.in);
        int t=sc.nextInt();
        while(t-->0){
            n=sc.nextInt();
            m=sc.nextInt();
            for(int i=0;i<n;i++){
                for(int j=0;j<m;j++){
                    w[i][j]=sc.nextInt();
                }
            }
            long res=0;
            for(int i=0;i<=n-1-i;i++){
                for(int j=0;j<=m-1-j;j++){
                    List<int[]>list=new ArrayList();
                    Set<Integer>set=new HashSet();
                    set.add(getSum(i,j));
                    list.add(new int []{i,j});
                    if(!set.contains(getSum(i,m-1-j))){
                        list.add(new int[]{i,m-1-j});
                        //为啥 这部分 必须要注释掉？不注释掉就不对呢？
                        // set.add(getSum(i,m-1-j));
                    }
                    if(!set.contains(getSum(n-1-i,j))){
                        list.add(new int[]{n-1-i,j});
                        // set.add(getSum(n-1-i,j));
                    }
                    if(!set.contains(getSum(n-1-i,m-1-j))){
                        list.add(new int[]{n-1-i,m-1-j});
                        // set.add(getSum(n-1-i,m-1-j));
                    }

                    res+=calc(list);
                }

            }
            System.out.println(res);
        }
    }
}