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 "soccer.h"
#include <bits/stdc++.h>
using namespace std;
int dx[] = {1, -1, 0, 0};
int dy[] = {0, 0, 1, -1};
int biggest_stadium(int N, vector<vector<int>> F) {
vector<vector<int>> vis(N, vector<int>(N, 0));
queue<pair<int,int>> q;
for (int i=0; i<N; i++) {
for (int j=0; j<N; j++) {
if (F[i][j] == 0) {
vis[i][j] = 1;
q.push({i, j});
break;
}
}
if (!q.empty()) break;
}
while (!q.empty()) {
int x = q.front().first;
int y = q.front().second;
q.pop();
for (int k=0; k<4; k++) {
int nx = x + dx[k];
int ny = y + dy[k];
if (nx < 0 || nx >= N || ny < 0 || ny >= N) continue;
if (vis[nx][ny]) continue;
vis[nx][ny] = 1;
q.push({nx, ny});
}
}
for (int i=0; i<N; i++) {
for (int j=0; j<N; j++) {
if (F[i][j] == 0 && vis[i][j] == 0) {
return 0;
}
}
}
int tot = 0;
bool flag = false;
int pl = -1, pr = -1;
for (int i=0; i<N; i++) {
int l = -1, r = -1, cnt = 0;
for (int j=0; j<N; j++) {
if (F[i][j] == 0) {
if (l == -1) l = j;
r = j;
cnt ++;
}
}
if (cnt == 0) {
pl = -1; pr = -1;
continue;
}
if (r - l + 1 != cnt) {
return 0;
}
if (pl != -1) {
if (!flag) {
if (l <= pl && pr <= r) {}
else if (pl <= l && r <= pr) {
flag = true;
}
else return 0;
}
else {
if (pl <= l && r <= pr) {}
else return 0;
}
}
pl = l; pr = r;
tot += cnt;
}
flag = false;
pl = -1; pr = -1;
for (int i=0; i<N; i++) {
int l = -1, r = -1, cnt = 0;
for (int j=0; j<N; j++) {
if (F[j][i] == 0) {
if (l == -1) l = j;
r = j;
cnt ++;
}
}
if (cnt == 0) {
pl = -1; pr = -1;
continue;
}
if (r - l + 1 != cnt) {
return 0;
}
if (pl != -1) {
if (!flag) {
if (l <= pl && pr <= r) {}
else if (pl <= l && r <= pr) {
flag = true;
}
else return 0;
}
else {
if (pl <= l && r <= pr) {}
else return 0;
}
}
pl = l; pr = r;
}
return tot;
}
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