风痕's submissions for 1175 等比数列

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风痕
on Oct. 15, 2008, 6:52 p.m.
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风痕
on Oct. 15, 2008, 6:51 p.m.
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152.00 KB
风痕
on Oct. 15, 2008, 6:50 p.m.
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152.00 KB