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问一个问题哈

Posted by 200609020331 at 2009-03-05 16:59:25 on Problem 3660 
为什么初度与入度的和为N-1就能把它确定出来，小弟一直没明白，数学基础差了，感谢各位帮我解答一下，谢谢！！
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