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关于这道题，我要说.....................好题！............

Posted by seol at 2005-02-15 16:54:11 on Problem 1942
In Reply To:dp...[unsigned long]*[unsigned long]...直接公式吧 Posted by:ArXoR at 2005-02-15 14:52:49 
The first：终于认识到了要用__int64做
The second：令我“回忆”起了组合数的公式。（大家伙儿最初学的那个，不是貌似好用的递推公式————笑倒....）
The third：WA了、TLE了、PE了........怎么办？.........多submit几次，水到渠成啊！
The last：谢谢ArXoR大哥提示了我这道“难”题的解法！
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