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 biggest_stadium(int N, vector<vector<int>> F){
map<tuple<int,int,int>,bool>libre;
for(int fila=0;fila<N;fila++){
for(int i=0;i<N;i++){
for(int j=i;j<N;j++){
if(i==j){
libre[{fila,i,j}]=!F[fila][j];
}
else{
libre[{fila,i,j}]=(!F[fila][j])&&libre[{fila,i,j-1}];
}
}
}
}
int best=0;
for(int fila=0;fila<N;fila++){
for(int columna=0;columna<N;columna++){
for(int i=0;i<=columna;i++){
for(int j=columna;j<N;j++){
if(libre[{fila,i,j}]){
vector<pair<int,int>>almacen;
almacen.push_back({i,j});
int suma=0;
int fil=fila-1;
while(fil>=0&&F[fil][columna]!=1){
int l=columna,r=columna;
while(l>=almacen.back().first&&r<=almacen.back().second){
if(libre[{fil,l-1,r}]&&(l-1)>=almacen.back().first){
l--;
}
else if(libre[{fil,l,r+1}]&&(r+1)<=almacen.back().second){
r++;
}
else{
break;
}
}
almacen.push_back({l,r});
fil--;
}
almacen.push_back({i,j});
fil=fila+1;
int fila_extra=1;
int alm_ant=almacen.size();
while(fil<N&&F[fil][columna]!=1){
if(fila_extra<alm_ant){
int l1=columna,r1=columna;
l1=almacen[alm_ant].first;
r1=almacen[alm_ant].second;
while(l1>=almacen.back().first&&r1<=almacen.back().second){
if(libre[{fil,l1-1,r1}]&&(l1-1)>=almacen.back().first){
l1--;
}
else if(libre[{fil,l1,r1+1}]&&(r1+1)<=almacen.back().second){
r1++;
}
else{
break;
}
}
int l=columna,r=columna;
while(l>=almacen[fila_extra].first&&r<=almacen[fila_extra].second){
if(libre[{fil,l-1,r}]&&(l-1)>=almacen[fila_extra].first){
l--;
}
else if(libre[{fil,l,r+1}]&&(r+1)<=almacen[fila_extra].second){
r++;
}
else{
break;
}
}
if(libre[{fil,l1,r1}]&&l1>=almacen.back().first&&r1<=almacen.back().second){
almacen.push_back({l1,r1});
}
else{
almacen.push_back({l,r});
}
fil++;
fila_extra++;
}
else{
int l=columna,r=columna;
while(l>=almacen.back().first&&r<=almacen.back().second){
if(libre[{fil,l-1,r}]&&(l-1)>=almacen.back().first){
l--;
}
else if(libre[{fil,l,r+1}]&&(r+1)<=almacen.back().second){
r++;
}
else{
break;
}
}
almacen.push_back({l,r});
fil++;
}
}
for(auto[x,y]:almacen){
suma+=(y-x+1);
}
suma-=(j-i+1);
best=max(suma,best);
}
else{
continue;
}
}
}
}
}
return best;
}
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