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OI-codes/Luogu/P1387/P1387.cpp
2021-11-30 13:01:22 +08:00

39 lines
831 B
C++

#include <bits/stdc++.h>
using std::cin;
using std::cout;
using std::endl;
int n, m, ans;
bool g[105][105];
bool check(int x1, int y1, int x2, int y2) {
for (int i = x1; i <= x2; i++) {
for (int j = y1; j <= y2; j++) {
if (!g[i][j]) return false;
}
}
return true;
}
int main() {
cin >> n >> m;
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= m; j++) {
cin >> g[i][j];
}
}
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= m; j++) {
for (int k = 1; k <= std::min(n, m); k++) {
if (i + k > n || j + k > m) break;
if (check(i, j, i + k - 1, j + k - 1)) {
ans = std::max(ans, k);
}
}
}
}
cout << ans << endl;
return 0;
}