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wa了数十次终于用逆元过了

Posted by Tornado at 2011-07-20 09:47:37 on Problem 1845
In Reply To:Re:用逆元wa到不行 很想知道这道题有没有人用逆元过的啊~ Posted by:305636397 at 2011-07-05 10:03:31 
要注意两种特殊情况：
x%9901==1的情况比较容易引起警觉，这种情况下不能用逆元，直接输出n+1就好了；
x%9901==0则比较隐蔽，因为通常都是求x^(n+1)%9901，然后再减一，一不注意就输出-1了
我一开始就注意到第一种了，结果在第二个错误上wa到吐血
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