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\u003c/style\u003e","sections":[{"title":"","value":{"format":"HTML","content":"众所周知，宋老板是金水区最富有的人。现在宋老板的船队在大西洋附近，这里有一块矩形区域，这个区域长为h，宽为w。每个小区域为1*1的正方形，该区域由h*w个小区域组成。每个区域可能是陆地也可能是海洋。如果为陆地则为‘*’，海洋为‘ . ’。现在宋老板想知道是否可以找到一块陆地，从这块陆地向上或向下或向左或向右走，可以到达这个区域所有的陆地。换句话说，是否存在一个+形状的区域，这块陆地在加号形状的中心，其他陆地在加号上下左右的四条边上面。且所有陆地区域是联通的。除此之外还要保证这块陆地的上下左右都至少有一块陆地区域。\n"}},{"title":"Input","value":{"format":"HTML","content":"输入h和w。（h和w小于1000）接下来是一个h行w列的点阵。表示这个区域。其中‘*‘表示陆地，‘.’表示海洋。"}},{"title":"Output","value":{"format":"HTML","content":"如果可以找到这样一块区域，输出“YES”，否则输出“NO”。"}},{"title":"Examples","value":{"format":"HTML","content":"\u003cdiv class\u003d\"sample-test\"\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n 输入\n \u003c/div\u003e\n \u003cpre\u003e5 6\n......\n..*...\n.****.\n..*...\n..*...\n\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n 输出\n \u003c/div\u003e\n \u003cpre\u003eYES\n\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n 输入\n \u003c/div\u003e\n \u003cpre\u003e3 5\n..*..\n****.\n.*...\n\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n 输出\n \u003c/div\u003e\n \u003cpre\u003eNO\n\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n 输入\n \u003c/div\u003e\n \u003cpre\u003e7 7\n.......\n...*...\n..****.\n...*...\n...*...\n.......\n.*.....\n\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n 输出\n \u003c/div\u003e\n \u003cpre\u003eNO\n\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n 输入\n \u003c/div\u003e\n \u003cpre\u003e5 6\n..**..\n..**..\n******\n..**..\n..**..\n\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n 输出\n \u003c/div\u003e\n \u003cpre\u003eNO\n\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n 输入\n \u003c/div\u003e\n \u003cpre\u003e3 7\n.*...*.\n***.***\n.*...*.\n\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n 输出\n \u003c/div\u003e\n \u003cpre\u003eNO\n\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e"}},{"title":"Note","value":{"format":"HTML","content":"宋老板是一个知恩图报的人，如果你可以帮助宋老板，宋老板将会感谢你的。"}}]}