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不知偶理解的对不对:

Posted by Jaakques at 2008-12-07 18:11:48
In Reply To:在纸上画了半天... Posted by:twilight at 2008-12-07 17:57:10 
   e
  / \
 /   \
a--b--c
 \   /
  \ /
   d

这样的话也没有c[i]>1，这个图有解吗？
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