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WA的过来凑一凑，看看你是不是这个问题（水题有时候也可能WA哦）

Posted by lihuiyykl at 2009-08-16 20:39:15 on Problem 1654 
可以说这道题是水题，但是很容易犯一些恶心的错误。
主要是精度问题，大家可以用long long,也可以用__int64，用double有时候会错，至少我错了，希望对过路人有帮助
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