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    李欣柠干的好事——呈堂证供 image

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    #include<bits/stdc++.h>
    using namespace std;
    int n, ha, la, hb, lb, ans = 0;
    int x2[105][105];
    int dx[4] = {-1, 1, 0, 0}, dy[4] = {0, 0, -1, 1};
    char x1[105][105];
    void dfs(int x, int y) {
    	if (x == hb && y == lb) {
    		ans = 1;
    		return;
    	}
    	if(x1[ha][la]=='#') {
    		return ;
    	}
    	for (int i = 0; i < 4; i++) {
    		int nx = x + dx[i], ny = y + dy[i];
    		if (nx < n && nx >= 0 && ny < n && ny >= 0 && x2[nx][ny] == 0 && x1[nx][ny] == '.') {
    			x2[nx][ny] = 1;
    			dfs(nx, ny);
    		}
    	}
    }
    int main() {
    	int s;
    	cin >> s;
    	for (int i = 1; i <= s; i++){
    		cin >> n;
    		for (int i = 0; i < n; i++){
    			for (int j = 0; j < n; j++){
    				cin >> x1[i][j];
    			}
    		}
    		cin >> ha >> la >> hb >> lb;
    		memset(x2, 0, sizeof(x2));
    		ans = 0;
    		x2[ha][la] = 1;
    		dfs(ha, la);
    		if (ans == 0) {
    			cout << "NO" << endl;
    		} else if (ans == 1) {
    			cout << "YES" << endl;
    		}
    	}
    	return 0;
    }
    

    cout<<32932995

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