匈牙利算法3(转载) - Something TO DO
匈牙利算法3(转载)
Something TO DO
posted @ 2016年11月06日 17:01
in math
, 1000 阅读
这是转载的文章,如果想要系统的看,可以从匈牙利算法1http://mario.is-programmer.com/posts/52265.html开始看起!!!
这是一种用增广路求二分图最大匹配的算法。它由匈牙利数学家Edmonds于1965年提出,因而得名。 定义 未盖点:设Vi是图G的一个顶点,如果Vi 不与任意一条属于匹配M的边相关联,就称Vi 是一个未盖点。
交错路:设P是图G的一条路,如果P的任意两条相邻的边一定是一条属于M而另一条不属于M,就称P是一条交错路。
可增广路:两个端点都是未盖点的交错路叫做可增广路。
流程图
伪代码:
bool 寻找从k出发的对应项出的可增广路 { while (从邻接表中列举k能关联到顶点j) { if (j不在增广路上) { 把j加入增广路; if (j是未盖点 或者 从j的对应项出发有可增广路) { 修改j的对应项为k; 则从k的对应项出有可增广路,返回true; } } } 则从k的对应项出没有可增广路,返回false; } void 匈牙利hungary() { for i->1 to n { if (则从i的对应项出有可增广路) 匹配数++; } 输出 匹配数; }
演示
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