hdu2571

if(x==1) f(x,y)=max{f(x,y-1),f(x,z)}  {y%z==0&&1<y/z<=y&&1<=z<<y}

else　　f(x,y)=max{f(x-1),f(x,y-1),f(x,z)} {y%z==0&&1<y/z<=y&&1<=z<=y}

#include <stdio.h>
#include <math.h>
int mmax(int a,int b){
    int t;
    if(a>b) t=a;
    else    t=b;
    return t;
}
int main(){
    int t,n,m,i,j,res,max,z;
    int tmp;
    int f[25][1100];
    int gird[25][1100];
    scanf("%d",&t);
    while(t--){
        scanf("%d%d",&n,&m);
        for(i=1;i<=n;++i)
            for(j=1;j<=m;++j){
                scanf("%d",&gird[i][j]);
                f[i][j]=-1000000;
            }
    
        for(i=1;i<=m;++i){
            if(i==1) {f[1][i]=gird[1][i];continue;}
            f[1][i]=mmax(f[1][i],f[1][i-1]);
            for(z=1;z<=i;++z){
                if(i%z==0&&i/z>1&&i/z<=i){
                    f[1][i]=mmax(f[1][i],f[1][z]);
                }
            }
            f[1][i]+=gird[1][i];
        }
        for(i=2;i<=n;++i){
            for(j=1;j<=m;++j){
                if(j==1) {f[i][j]=gird[i][j]+f[i-1][j];continue;}
                f[i][j]=mmax(f[i-1][j],f[i][j-1]);
                for(z=1;z<=j;++z){
                    if(j%z==0&&j/z>1&&j/z<=j){
                        f[i][j]=mmax(f[i][j],f[i][z]);
                    }
                }
                f[i][j]=f[i][j]+gird[i][j];
            }
        }
        printf("%d\n",f[n][m]);
    }
    return 0;
}