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Re:感谢这位大牛的数据,,,,,原来似乎不能用费用流或者KM来算,,,

Posted by zcube at 2012-07-27 09:32:58 on Problem 2404
In Reply To:感谢这位大牛的数据,,,,,原来似乎不能用费用流或者KM来算,,, Posted by:yy17yy at 2011-03-07 21:45:04
> 
> 
> 看到带状态压缩的就头疼,,,KM我不会,,,于是选择了费用流,,,
> 
> 结果这组数据就过不了,,发现原因是带权图的匹配对于对称的数据也未必会对称的连边,,这点和最大匹配很不一样,,而做这个题显然期望它对称连边,,,
> 
> 我的费用流连边情况,,,将残留的度数为奇数的点拆开,分为2组,,源点和左边的一组连边,流量1,费用0,,汇点和右边的一组连边,流量1,费用0,,左边和右边的连边,,流量1,费用最短距离,,
> ,然后我输出了费用流的连边的情况,,发现是这样的,,1->6',,,2->3',,,3->4',,,4->2',,5->1',,,6->5',,,这显然是不对称的,,所以是错误的,,,
> 
> 估计用KM也是类似的情况,,希望能那些WA的一些提示,,,换方法吧,,,我去研究dp了,,,

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