30 lines
574 B
C++
30 lines
574 B
C++
#include<cstdio>
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#include<cstring>
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#define fr(i,n) for(int i=1;i<=n;i++)
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int n,x,y,z,m;
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int a[51][51];
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int sum[51][51][51][51];
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int max(int a,int b)
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{
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return a>b?a:b;
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}
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int main(void)
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{
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scanf("%d%d",&n,&m);
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fr(i,n)
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fr(j,m)
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scanf("%d",&a[i][j]);
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fr(i,n)
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fr(j,m)
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fr(h,n)
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fr(k,m)
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{
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sum[i][j][h][k]=max(max(sum[i-1][j][h-1][k],sum[i][j-1][h][k-1]),
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max(sum[i-1][j][h][k-1],sum[i][j-1][h-1][k]))+a[i][j];
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if (i!=h&&j!=k)
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sum[i][j][h][k]+=a[h][k];
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}
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printf("%d\n",sum[n][m][n][m]);
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return 0;
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}
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