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第一个用例的结果为什么不是150呢？

Posted by fanhao20072605 at 2009-03-28 17:27:11 on Problem 1784 
如果树根为25，20和25分别为其左右子树，15和15又为20的左右子树，
则cost=25*（1+0）+20*（1+1）+25*1+15*2+15*2=150。为啥不是这个呢？
可能是题意我没有理解透，望各位指点迷津！
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