This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <cstdio>
int n,m,gs[310][310],hs[310][310],gshs[310][310];
int koi(int a,int b)
{
if(hs[a][b]!=-987654321) return hs[a][b];
int x=0,y=0;
if(a==n){ for(int i=b; i<=m; i++) x+=gs[a][i]; return x; }
if(b==m){ for(int i=a; i<=n; i++) x+=gs[i][b]; return x; }
for(int i=a; i<=n; i++)
for(int j=b; j<=m; j++) y+=gs[i][j];
for(int i=a; i<n; i++)
for(int j=b; j<m; j++)
{
x=gshs[i][j]+gshs[a-1][b-1]-gshs[a-1][j]-gshs[i][b-1];
x+=koi(i+1,j+1);
if(y<x) y=x;
}
hs[a][b]=y;
return hs[a][b];
}
int main()
{
scanf("%d%d",&n,&m);
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++) scanf("%d",&gs[i][j]);
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++) hs[i][j]=-987654321;
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++) gshs[i][j]+=gs[i][j]+gshs[i-1][j]+gshs[i][j-1]-gshs[i-1][j-1];
printf("%d",koi(1,1));
}
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