Submission #1106805

#	Time	Username	Problem	Language	Result	Execution time	Memory
1106805		stdfloat	Bomb (IZhO17_bomb)	C++17	24 / 100	1100 ms	7160 KiB

bomb

#include <bits/stdc++.h>
using namespace std;

using ll = long long;

int main() {
	ios::sync_with_stdio(false); cin.tie(nullptr);

	int n, m;
	cin >> n >> m;

	vector<string> a(n);
	for (auto &i : a)
		cin >> i;

	if ((ll)n * m * n * m * n * m > (int)1e8) {
		int mn1 = n, mn2 = m;
		for (int i = 0; i < n; i++) {
			for (int j = 0; j < m; j++) {
				if (a[i][j] == '0') continue;

				int l = i, r = i;
				while (0 < l && a[l - 1][j] == '1') l--;
				while (r + 1 < n && a[r + 1][j] == '1') r++;
				mn1 = min(mn1, r - l + 1);

				l = r = j;
				while (0 < l && a[i][l - 1] == '1') l--;
				while (r + 1 < m && a[i][r + 1] == '1') r++;
				mn2 = min(mn2, r - l + 1);
			}
		}

		return cout << mn1 * mn2, 0;
	}

	int mx = 1;
	for (int x = 1; x <= n; x++) {
		for (int y = 1; y <= m; y++) {
			if (x * y <= mx) continue;

			bool ok = true;
			vector<vector<bool>> vis(n, vector<bool>(m));
			for (int i = 0; i + x <= n; i++) {
				for (int j = 0; j + y <= m; j++) {
					if (a[i][j] == '0') continue;

					bool tr = true;
					for (int k = i; k < i + x && tr; k++) {
						for (int l = j; l < j + y && tr; l++)
							tr = (a[k][l] == '1');
					}

					ok = vis[i][j];
					if (!tr) continue;

					for (int k = i; k < i + x; k++) {
						for (int l = j; l < j + y; l++)
							vis[k][l] = true;
					}
					
					ok = vis[i][j];
				}
			}

			for (int i = 0; i < n && ok; i++) {
				for (int j = 0; j < m && ok; j++)
					ok = (a[i][j] == '0' || vis[i][j]);
			}

			if (ok) mx = max(mx, x * y);
		}
	}

	cout << mx;
}

• Subtask 1: 24 / 100