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一次AC ,但是还是有些不明白,请教大牛们

Posted by abilitytao at 2009-08-31 21:28:44 on Problem 3020
建图的时候,我是正反都建立了一次,如果按照我的算法,如果正边匹配一次,那么反向边一定也要匹配一次,直观上来说 好像是不错的,但是我没法给出证明.
还有,这道题与以往的二分匹配不同,在于这里的点应该认为是相同的点,而不是二分图中两侧不相同的点,联系在哪?区别又在哪?

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