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太旧了，一根两头点着，另一根一头点着；等前一根烧完了，把后一根的另一头也点着就行了。
rabbitbug
(痛苦的兔八哥)
(#300850@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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