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十分感谢大牛提醒~~~

Posted by kaitian521 at 2010-10-30 09:03:46 on Problem 1029
第一 : 有且仅有一个硬币是不同的:0个或者1个以上硬币都满足的话是错误的
第二 : 如果一个硬币没有出现在任何等式(或者不等式)中 , 他不一定就是真的

eg 
5 2
1 2
=
3 4
=

answer is  5 !!!

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