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我的理解是：once是为了说明后面的10^4，意思是如果no more than once不会超过10^4，给个范围。

Posted by zerocpp at 2011-05-02 02:38:13 on Problem 1860 and last updated at 2011-05-02 02:41:35
In Reply To:Re:每个exchange point只能使用一次 怎么可能YES呢 Posted by:It_is_rainning_now at 2010-10-16 09:05:15 
> bs下这种人，说下意思会死
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