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Discussion of Problem 1117. HierarchyAt the first glance,this problem is hard to understand what it says and seem to be difficult.After thinking for a while,you'll find it can be done in a very easy way.(Email:hyz12345678@163.com) Posted by Huang Yizheng 29 Dec 2001 05:06 Re: At the first glance,this problem is hard to understand what it says and seem to be difficult.After thinking for a while,you'll find it can be done in a very easy way.(Email:hyz12345678@163.com) Posted by sloboz 3 Jun 2004 19:32 |