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GA coding question

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Hello. I'm trying to implement a simple GA using the Traveling Salesman Probem. I'm using "AI Techniques for Game Programming". For my GA code, I need to have random numbers between 0 to N (# cities). This will be a solution (chromosome). How can I have them be random and not have duplicates? Thanks for the help.

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Pick all the numbers in turn, stick them in a list, array, or whatever, and then shuffle them. std::random_shuffle() will do this for you in C++ and random.shuffle() works in Python.

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