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>
#define int long long
using namespace std;
string yn(bool ans,string y="YES",string n="NO"){
return (ans?y:n);
}
#define all(a) a.begin(),a.end()
void gogo(){
int n,m;
cin>>n>>m;
int a[n][m];
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
cin>>a[i][j];
}
}
int ans=-INT_MAX;
int mn[n+1][m];
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
mn[i][j]=a[i][j]-i-j;
if(i>0){
mn[i][j]=min(mn[i][j],mn[i-1][j]);
}
if(j>0){
mn[i][j]=min(mn[i][j],mn[i][j-1]);
}
if(j and i){
mn[i][j]=min(mn[i][j],mn[i-1][j-1]);
}
}
}
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
ans=max(ans,a[i][j]-i-j-mn[i][j]);
}
}
for(int i=0;i<n;i++){
reverse(a[i],a[i]+m);
}
for(int i=0;i<n-i-1;i++){
for(int j=0;j<m;j++){
swap(a[i][j],a[n-1-i][j]);
}
}
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
mn[i][j]=a[i][j]-i-j;
if(i>0){
mn[i][j]=min(mn[i][j],mn[i-1][j]);
}
if(j>0){
mn[i][j]=min(mn[i][j],mn[i][j-1]);
}
if(j and i){
mn[i][j]=min(mn[i][j],mn[i-1][j-1]);
}
}
}
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
ans=max(ans,a[i][j]-i-j-mn[i][j]);
}
}
for(int i=0;i<n-i-1;i++){
for(int j=0;j<m;j++){
swap(a[i][j],a[n-1-i][j]);
}
}
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
mn[i][j]=a[i][j]-i-j;
if(i>0){
mn[i][j]=min(mn[i][j],mn[i-1][j]);
}
if(j>0){
mn[i][j]=min(mn[i][j],mn[i][j-1]);
}
if(j and i){
mn[i][j]=min(mn[i][j],mn[i-1][j-1]);
}
}
}
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
ans=max(ans,a[i][j]-i-j-mn[i][j]);
}
}for(int i=0;i<n;i++){
reverse(a[i],a[i]+m);
}
for(int i=0;i<n-i-1;i++){
for(int j=0;j<m;j++){
swap(a[i][j],a[n-1-i][j]);
}
}
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
mn[i][j]=a[i][j]-i-j;
if(i>0){
mn[i][j]=min(mn[i][j],mn[i-1][j]);
}
if(j>0){
mn[i][j]=min(mn[i][j],mn[i][j-1]);
}
if(j and i){
mn[i][j]=min(mn[i][j],mn[i-1][j-1]);
}
}
}
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
ans=max(ans,a[i][j]-i-j-mn[i][j]);
}
}
cout<<ans-1<<endl;
}
main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
long long t=1;
// cin>>t;
while(t--){
gogo();
}
}
Compilation message (stderr)
maxcomp.cpp:117:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
117 | main(){
| ^~~~
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