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你的方法是对的，我的只适用于两根一模一样的，而且速度相同的两头摆在一起。惭愧。
pyramid
(金字塔)
(#300827@0)
Last Updated: 2001-12-16
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也出一题， 给你二根导火索， 每根可各燃1小时， 但燃烧速度不一定均匀， based on this, 请测出45分钟来.
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