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In order to use the offline tester / visualizer tool for testing your solution locally, you'll have to modify your solution by adding the main method that interacts with the tester / visualizer via reading data from standard input and writing data to standard output. As long as you do not change the implementation of the methods initialize and dispatch, this doesn't affect the way your solution works when submitted to our server.

Here are example solutions for C++ and Java, modified to be executed with visualizer. They both implement the same approach: send each car in random direction.

To run the tester with your solution, you should run:

java -jar Tester.jar -exec "<command>" -seed <seed>

Here, <command> is the command to execute your program, and <seed> is seed for test case generation. If your compiled solution is an executable file, the command will be the full path to it, for example, "C:\TopCoder\solution.exe" or "~/topcoder/solution". In case your compiled solution is to be run with the help of an interpreter, for example, if you program in Java, the command will be something like "java -cp C:\TopCoder Solution".

Additionally you can use the following options:

-vis : Turns on visualization.
-delay <delay> : Sets the delay (in milliseconds) between visualizing consecutive simulation steps. The default value is 100.
-size <SZ> : Sets size of city block for visualization.
-timelimit <TL> : Sets time limit enforced on your solution, in seconds. Default is 20.

Finally, you can print any debug information of your solution to standard error, and it will be forwarded to the standard out of the tester.