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1)关于with...as用的用法,这个主要是用于替换try...finally; 更多可以参见:理解Python中的with…as…语法示例代码:try: with open("foo.txt", "w+") as fo: fo.write("www.iptython.me")... 阅读全文
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问题描述In graph theory, the shortest path problem is the problem of finding a path between two vertices in a graph such that the sum fo the weights of it... 阅读全文
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背景:What is the minimum spanning tree? Given a connected , undirected graph, a spnning tree without circle of that graph is a subgraph that is a tree a... 阅读全文
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问题描述:最大流问题的一个基本描述:如下图所示,s是源点,t为汇点,每条边上数字的含义是边能够允许流过的最大流量。可以将边看成管道,0/3代表该管道每秒最多能通过3个单位的流量,0代表当前流量。最大流问题即是说,从s点到t点,最大允许流量是多少?相关算法:Let G(V,E) be a graph,... 阅读全文