> 这一题看记录，我都写了一个月了，权重，分析，穷举3种方法都用了，所有见到过的测试数据都过了，就是没有发现问题。。。。
> 
> 然后和同学讨论之下，发现是用了fflush函数清除缓冲，原来是为了防止有回车干扰而清除的，但是可能就像他说的“可能JUDGE是先一次性把数据都存进BUFF的,你一清,等于没开始做题就做完了...”
> 
> 导致我一直没AC，去掉之后，权重和穷举都AC了。。。
> 
> 唉，亏我写了那么多遍啊。。。。
> 
> 后面是我收集的测试数据，不过这题真的不难，真的是细节啊。。。。
> ----------------------------------------
> 6
> ABCD EFGH even
> ABCI EFJK up
> ABIJ EFGH even
> ABCD EFGH even
> ABCI EFJK down
> ABIJ EFGH even
> ABCD EFGK up
> EFDL ABGK up
> GHIJ EFDK up
> A B up
> B C down
> AC BD up
> A B even
> A C down
> E F even
> A B down
> B C up
> G E even
> ------------------------------------------
> K is the counterfeit coin and it is light.
> K is the counterfeit coin and it is heavy.
> K is the counterfeit coin and it is light.
> B is the counterfeit coin and it is light.
> C is the counterfeit coin and it is heavy.
> B is the counterfeit coin and it is heavy.