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题目说了一个grid不可能属于2个以上的墙,但是poj给出的测试数据貌似存在这种情况!!求真相.我用排序右边界的程序生成了数据,另外一个程序不能处理重复的情况,所以一出现重复数据就wa,不重复的就ok. Followed by:
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