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樓上的欠考慮啊…… 包在體積內部的表面越多,表面積越小, 所以,最小的應該是2x2x3的長方體. 其實可以嚴格證明的,設長寬高為a,b,c. 於是abc=12,則表面積為S=2x(ab+bc+ac)=24x(1/a+1/b+1/c). 之後,列舉所有可能的整數解,可以很方便的找到目標解~
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