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比较函数要满足偏序关系才能正确排序

Posted by wywcgs at 2007-02-06 19:26:16 on Problem 2640
In Reply To:用快排居然出错，用冒泡一下就AC了，终于AC这道题！！ Posted by:ecjtubaowp at 2007-02-06 17:39:43 
具体来说，就是

Irreflexivity 	x < x must be false.
Antisymmetry 	x < y implies !(y < x) [2]
Transitivity 	x < y and y < z implies x < z [3]

以上摘自SGI STL Guide里的一段
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