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难道最快只能是O(n^2 * n!)了吗???

Posted by Roy at 2007-02-22 04:04:47 on Problem 1012
我用马甲打表提交过了,直接算的话仍然还是TLE,能不能用数学方法解决掉啊?
谁能提供一下公式?谢谢....

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