yangyang's submissions for 1175 等比数列

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yangyang
on March 18, 2008, 8:32 p.m.
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yangyang
on March 18, 2008, 8:31 p.m.
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yangyang
on March 18, 2008, 8:30 p.m.
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152.00 KB
yangyang
on March 18, 2008, 8:22 p.m.
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152.00 KB