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注意数据坑爹的情况，R、N都可能有等于0的情况。

Posted by 505745416 at 2012-07-08 16:06:44 on Problem 1001 and last updated at 2012-07-08 16:07:15 
我的程序交上去WA，特判一个R、N=0，就AC了。
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