高三电机2 排列的例子 “triangle”的排法

第一种做法比较复杂,建议你们了解第二种做法。

https://chtanmaths.wordpress.com/2011/05/07/triangle%e6%b2%a1%e6%9c%89%e4%b8%a4%e4%b8%aa%e6%af%8d%e9%9f%b3%e5%9c%a8%e4%b8%80%e8%b5%b7%e7%9a%84%e5%85%a8%e9%83%a8%e6%8e%92%e6%b3%95/

 

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