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COSC 2P03 Advanced Data Structures: Assignment 4

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 Work according to the instructions given in the assignment.. algorithms

 

 

Your Tasks (8 Marks) 1. Define a class named TransportNet which has data attributes to represent the graph (i.e. the transportation network) and has methods as required below.

2. Within the TransportNet class, define a method named readData to read the information from the two attached CSV text files (cities.txt for vertices in your graph, distances for edges in your graph). These two files will help you create your weighted undirected graph. You should use adjacency matrix to represent edges. (1 mark)

3. Within the TransportNet class, define a method named findShortestPath based on Dijkstra’s algorithm to find the shortest path between two given cities on the graph. For example, if you call findShortestPath( "Windsor", "Ottawa"), it should return the shortest path (i.e. a sequence of city names) and the total cost (i.e. the sum of weights on the shortest path). You can either use Java’s built-in priority queue implementation or implement it yourself. (2 marks)

4. Within the TransportNet class, define a method named MST based on Kruskal’s idea to return a minimum spanning tree of your graph and the total cost of this tree (i.e. the sum of weights on the tree). You are allowed to use code from the textbook and lecture slides. (3 marks)

5. In the main function, create an instance/object (with name tn) of your TransportNet class. Call readData() to create your graph. Call functions findShortestPath( "Windsor", "Ottawa") and findShortestPath( "Arnprior", "NOTL"). After each call of this function, you should write your results into a text file named results.txt. Use file IO rather than copy-and-paste printed messages from the screen. Furthermore, call MST() and then write the returned results to the results.txt file. (1 mark) Program comments: to maximize readability, you should properly comment your program. (1 mark)

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