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Re:为什么可以用d/t排序?有人能证明一下么?

Posted by litstrong at 2009-05-29 11:09:20 on Problem 3262
In Reply To:Re:为什么可以用d/t排序?有人能证明一下么? Posted by:wolf711988 at 2009-03-09 15:04:38 
> 
> 从N头牛中拿出两头牛A，B考虑
> 
> 首先，A先，或B先对其余的牛没有任何影响，N－2头牛造成的损失一样
> 那么要尽量减少损失，则要取2×TA×DB（赶A的情况）， 2×TB×DA（赶B的情况）中的较少者
> 两边同除以2×TA×TB得DB/TB DA/TA....
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