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Re:什么数据啊，根本不是一棵树

Posted by jason_yu at 2013-06-07 18:08:25 on Problem 1947
In Reply To:贴组数据……答案是2……虽然偶用ac的程序跑出来是1……~~~~(>_<)~~~~ Posted by:rayafjyblue at 2011-06-15 20:11:35 
> 20 15
> 19 18
> 8 20
> 1 20
> 11 18
> 4 9
> 7 4
> 5 14
> 11 5
> 15 5
> 3 6
> 12 14
> 2 13
> 4 8
> 3 18
> 4 15
> 2 11
> 19 16
> 17 8
> 16 10
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