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Flow Problem Problem Description Network flow is a well-known difficult problem for ACMers. Given a graph, your task is to find out the maximum flow for the weighted directed graph.  

Power Network Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be supplied with an amount s(u) >= 0 of p

Is the Information Reliable? Description The galaxy war between the Empire Draco and the Commonwealth of Zibu broke out 3 years ago. Draco established a line of defense called Grot. Grot is a

白书中写道： “算法基于这样的一个事实： 残量网络中任何一条从s到t的有向道路都对应一条原图中的增广路——只要求出该道路中所有残量的最小值d， 把对应的所有边上的流量增加d即可，这个过程称为增广。不难验证，如果增广前的流量满足3个条件，增广后仍然满足。 只要在残量网络中存在增广路，流量就可以增大；如果残量网络中不存在增广路，则当前流就是最大流。 3个条件： 1.容量限制（别超过容