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空树也是树

Posted by dynamic at 2004-03-14 14:36:29 on Problem 1308
In Reply To:什么数据出的问题呢？ Posted by:peanutgyz at 2004-03-14 03:53:24 
> 除了 0 0会是null， 只有一个root是要怎么表示的 ？
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