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Re:求解释啊~

Posted by Ruby931031 at 2012-03-21 20:37:35 on Problem 2240
In Reply To:求解释啊~ Posted by:Ruby931031 at 2012-03-21 20:28:39 
我理解了。。。自己跟自己兑换也是有向边，从左往右可以，从右往左不行。。。
改成 rate>1+eps就AC了（其中eps=1e-6）。。
被这道题折磨疯了。。。自己跟自己换。。还有方向。。。==！
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