4.2, due on October 11

I thought the explanations were really good when the book talked about graphs where DFS is better versus graphs where BFS is better. I hadn't thought about it before, but the explanations made sense. I also appreciated the xkcd comics that explained some of the concepts.

It was a little difficult to follow the proof for the fact that Dijkstra's algorithm always finds the shortest path. It would be nice to go over that in class to be able to understand it better.

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