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