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Graph Theory ITEC 320 Lecture 21

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Graph Theory Review Higher level usage of pointers –Factories –Flyweight –Disk pool Rationale Benefits / Downsides

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Graph Theory Outline Rationale Definition Methods of implementation Algorithms

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Graph Theory Cell phones How do they work (communication side)

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Graph Theory Cell Networks

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Graph Theory Other scenarios Computer networks Google maps Facebook friends Gaming

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Graph Theory Rationale How do you model a cell phone network on a computer? Why would you want to simulate a cell phone network?

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Graph Theory Graphs Composed of vertices and edges Vertices –Represent an object in a graph Edges –A connection between two vertices

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Graph Theory Variations Weighted graph –Toll road –Hotel cost –Identifiers Possible usage scenarios?

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Graph Theory Methods of implementation Arrays Pointers Benefits of each approach Downsides of each approach

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Graph Theory Code Should we use a package? What about generics?

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Graph Theory Searching How do you find information in a graph? Destination Start

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Graph Theory Breadth first For each node I am connected to –Is this the node I’m looking for? If I didn’t find it –For each node I am connected to Call breadth first search on it

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Graph Theory Depth first If I am the node searched for, stop and return For each node I am connected to –Call depth first search on that node

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Graph Theory Issues What are some of the issues that might happen with searching? How do you implement each way? –Stacks / Recursion / Packages / ?

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Graph Theory More How do you pick the best path? –Lowest cost –Highest cost –Cover all points with least overlap

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Graph Theory Summary Rationale for graph theory Approach Finding algorithms

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ITEC 320 Lecture 12 Higher level usage of pointers.

ITEC 320 Lecture 12 Higher level usage of pointers.

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