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WA到傻了。。终于知道原因了。。。。WA了M次。。据传此题要longlong。。改了上去。。WA。。 后来自己测了很多小数据，没什么问题。最后把心一横，写了个测试极限数据的。一运行，RE。。检查了下，发现原来是函数的类型还是longint。。改成longlong后就AC了。。 。。细心。。 Followed by:
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