liwei's submissions for 1174 1!到n!的和

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liwei
on April 18, 2012, 8:22 p.m.
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liwei
on April 16, 2012, 7:41 p.m.
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liwei
on April 16, 2012, 7:39 p.m.
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liwei
on April 11, 2012, 9:06 p.m.
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