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 <bits/stdc++.h>
using namespace std;
int a[1007][1007],ul[1007][1007],ud[1007][1007],ll[1007][1007],ld[1007][1007];
int main()
{
int n,m;
scanf("%d%d",&n,&m);
for(int i=0;i<n;i++) for(int j=0;j<m;j++) scanf("%d",&a[i][j]);
for(int i=0;i<n;i++) for(int j=0;j<m;j++)
{
ul[i][j]=-2000000000;
if(i>0) ul[i][j]=fmax(ul[i][j],ul[i-1][j]);
if(j>0) ul[i][j]=fmax(ul[i][j],ul[i][j-1]);
ul[i][j]=fmax(ul[i][j],-a[i][j]+i+j);
}
for(int i=0;i<n;i++) for(int j=m-1;j>=0;j--)
{
ud[i][j]=-2000000000;
if(i>0) ud[i][j]=fmax(ud[i][j],ud[i-1][j]);
if(j<m-1) ud[i][j]=fmax(ud[i][j],ud[i][j+1]);
ud[i][j]=fmax(ud[i][j],-a[i][j]+i-j);
}
for(int i=n-1;i>=0;i--) for(int j=0;j<m;j++)
{
ll[i][j]=-2000000000;
if(i<n-1) ll[i][j]=fmax(ll[i][j],ll[i+1][j]);
if(j>0) ll[i][j]=fmax(ll[i][j],ll[i][j-1]);
ll[i][j]=fmax(ll[i][j],-a[i][j]-i+j);
}
for(int i=n-1;i>=0;i--) for(int j=m-1;j>=0;j--)
{
ld[i][j]=-2000000000;
if(i<n-1) ld[i][j]=fmax(ld[i][j],ld[i+1][j]);
if(j<m-1) ld[i][j]=fmax(ld[i][j],ld[i][j+1]);
ld[i][j]=fmax(ld[i][j],-a[i][j]-i-j);
}
int sol=-2000000000;
for(int i=0;i<n;i++) for(int j=0;j<m;j++)
{
sol=fmax(sol,a[i][j]-i-j+ul[i][j]);
sol=fmax(sol,a[i][j]-i+j+ud[i][j]);
sol=fmax(sol,a[i][j]+i-j+ll[i][j]);
sol=fmax(sol,a[i][j]+i+j+ld[i][j]);
}
printf("%d",sol-1);
}
Compilation message (stderr)
maxcomp.cpp: In function 'int main()':
maxcomp.cpp:7:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&n,&m);
~~~~~^~~~~~~~~~~~~~
maxcomp.cpp:8:49: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
for(int i=0;i<n;i++) for(int j=0;j<m;j++) scanf("%d",&a[i][j]);
~~~~~^~~~~~~~~~~~~~~
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