#include "soccer.h"
#include <iostream>
#include <array>
#include <map>
#include <algorithm>
#include <cassert>
#include <string.h>
#define xx first
#define yy second
using namespace std;
typedef pair<int, int> pii;
const int maxN = 501;
int N, dp[maxN][maxN][maxN];
vector<vector<int>> pre;
int query(int li, int lj, int ri, int rj)
{
return pre[ri][rj] - (li ? pre[li - 1][rj] : 0) - (lj ? pre[ri][lj - 1] : 0) + (li && lj ? pre[li - 1][lj - 1] : 0);
}
pii calc_range(int i, int l, int r)
{
int li = i - 1, ri = i;
while (li >= 0 && query(li, l, i - 1, r) == 0)
li--;
while (ri < N && query(i, l, ri, r) == 0)
ri++;
return pii{li, ri};
}
int calc(int i, int l, int r)
{
if (dp[i][l][r] != -1)
{
return dp[i][l][r];
}
pii range = calc_range(i, l, r);
if (i != range.xx + 1)
{
return calc(range.xx + 1, l, r);
}
int li = range.xx;
int ri = range.yy;
int res = 0;
for (int L = l, R = l; R <= r; ++L, R = max(R, L))
{
auto extendable = [&](int R)
{
return (li >= 0 && query(li, L, i - 1, R) == 0) || (ri < N && query(i, L, ri, R) == 0);
};
if (!extendable(R))
{
continue;
}
while (R + 1 <= r && extendable(R + 1))
R++;
int Li = li;
int Ri = ri;
while (Li >= 0 && query(Li, L, i - 1, R) == 0)
Li--;
while (Ri < N && query(i, L, Ri, R) == 0)
Ri++;
res = max(res, calc(i, L, R) + (R - L + 1) * (li - Li + Ri - ri));
R++;
}
return dp[i][l][r] = res;
}
int biggest_stadium(int n, vector<vector<int>> C)
{
N = n, pre = C;
for (int i = 0; i < N; ++i)
{
for (int j = 0; j < N; ++j)
{
pre[i][j] += (j ? pre[i][j - 1] : 0);
}
}
for (int i = 0; i < N; ++i)
{
for (int j = 0; j < N; ++j)
{
pre[i][j] += (i ? pre[i - 1][j] : 0);
}
}
memset(dp, -1, sizeof dp);
int res = 0;
for (int i = 0; i < N; ++i)
{
pii range = calc_range(i, 0, N - 1);
res = max(res, calc(i, 0, N - 1) + N * (range.yy - range.xx - 1));
}
return res;
}
