解释矢虚's submissions for 1167 正方形面积

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解释矢虚
on Sept. 20, 2011, 10:01 a.m.
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解释矢虚
on Sept. 16, 2011, 10:32 a.m.
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解释矢虚
on Sept. 14, 2011, 9:12 a.m.
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