#include "soccer.h"
#include<bits/stdc++.h>
#define Gc() getchar() 
#define Me(x,y) memset(x,y,sizeof(x))
#define Mc(x,y) memcpy(x,y,sizeof(x))
#define d(x,y) ((m)*(x-1)+(y))
#define R(n) (rnd()%(n)+1)
#define Pc(x) putchar(x)
#define LB lower_bound
#define UB upper_bound
#define fi first
#define se second
#define eb emplace_back
using namespace std;using ll=long long;using db=double;using lb=long db;using ui=unsigned;using ull=unsigned long long;using pii=pair<int,int>;using LL=__int128;
const int N=2e3+5,M=5e5+5,K=(1<<25)+5,mod=998244353,Mod=mod-1;const db eps=1e-9;const int INF=1e9+7;mt19937 rnd(time(0));
int n,A[N][N],B[N];
namespace EE{
	int L[N],R[N];
	int CK(){
	int i,j;
	for(i=1;i<=n;i++){
		int flag=0;for(j=1;j<=n;j++) if(!A[i][j]) flag=1;
		if(!flag){L[i]=0;R[i]=-1;continue;}
		L[i]=1;while(A[i][L[i]]) L[i]++;
		R[i]=L[i];while(R[i]<n&&!A[i][R[i]+1]) R[i]++;
		for(j=R[i]+1;j<=n;j++) if(!A[i][j]) return 0;
	}
	int Mx=0;
	for(int i=1;i<=n;i++) if(L[i]&&R[i]-L[i]>=R[Mx]-L[Mx]) Mx=i;
	iota(B+1,B+n+1,1);
	sort(B+1,B+n+1,[&](int x,int y){return R[x]-L[x]!=R[y]-L[y]?R[x]-L[x]>R[y]-L[y]:abs(x-Mx)<abs(y-Mx);});
	int l=B[1],r=B[1];
	for(i=2;i<=n;i++) if(L[B[i]]){
		if(B[i]!=l-1&&B[i]!=r+1) return 0;
		if(!(L[B[i]]>=L[B[i-1]]&&R[B[i]]<=R[B[i-1]])) return 0;
		l=min(l,B[i]);r=max(r,B[i]);
	}
	int tot=0;for(i=1;i<=n;i++) if(L[i]) tot+=R[i]-L[i]+1;
	return tot;
}
}

struct node{
	int x,y,l,r;
}E[N*N];
int Eh,dp[N*N];
int f[N],st[N],sh,L[N],R[N];
int biggest_stadium(int nn, std::vector<std::vector<int>> F){
	n=nn;int i,j;
	for(i=1;i<=n;i++){
		for(j=1;j<=n;j++) A[i][j]=F[i-1][j-1];
	}
	if(n>30) return EE::CK();
	Me(f,0);
	for(i=1;i<=n;i++) {
		for(j=1;j<=n;j++) if(A[i][j]) f[j]=0;else f[j]++;
		sh=0;
		for(j=1;j<=n;j++){
			while(sh&&f[st[sh]]>f[j]) R[st[sh]]=j,sh--;
			L[j]=st[sh];st[++sh]=j;
		}
		while(sh) R[st[sh--]]=n+1;
		for(j=1;j<=n;j++) if(f[j]) E[++Eh]=(node){L[j]+1,R[j]-1,i-f[j]+1,i};
	}
	sort(E+1,E+Eh+1,[](node x,node y){return x.y-x.x!=y.y-y.x?x.y-x.x<y.y-y.x:x.r-x.l>y.r-y.l;});
	// for(i=1;i<=Eh;i++) cerr<<E[i].x<<' '<<E[i].y<<' '<<E[i].l<<' '<<E[i].r<<'\n';
	int ans=0;
	for(i=1;i<=Eh;i++){
		dp[i]=(E[i].y-E[i].x+1)*(E[i].r-E[i].l+1);
		for(j=1;j<i;j++) if(E[j].x>=E[i].x&&E[j].y<=E[i].y&&E[j].l<=E[i].l&&E[j].r>=E[i].r){
			dp[i]=max(dp[i],dp[j]+(E[i].r-E[i].l+1)*(E[i].y-E[i].x-(E[j].y-E[j].x)));
		}
		ans=max(ans,dp[i]);
	}
	return ans;
}