10求调，RE加WA

#include <bits/stdc++.h>
using namespace std;
int n, m, o = 1, b[2010];
char a[1005][1005], c[1005][1005];

int main() {
	cin >> n >> m;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= m; j++) {
			cin >> a[i][j];
			c[i][j] = a[i][j];
			if (a[i][j] == '#') {
				b[o] = i, b[o + 1] = j;
				o += 2;
			}

		}
	}
	int y = INT_MIN;
	for (int i = 1; i <= o - 2; i += 2) {
		c[b[i]][b[i + 1]] = '.';

		int cnt = 0;

		for (int u = 1; u <= n; u++) {
			for (int j = 1; j <= m; j++) {
//				cout << a[u][j] ;
				if (c[u - 1][j] != '#' && c[u + 1][j] != '#' && c[u][j - 1] != '#' && c[u][j + 1] != '#' && c[u][j] != '#' ) {
//					cout << u << " " << j<< endl;
					cnt++;
				}
			}
//			cout << endl;
		}
//		cout << endl;
		c[b[i]][b[i + 1]] = '#';
		y = max(y, cnt);
	}
	cout << y;

}