ServiceFacilities Visualization

To aid in the development of your submission, we are providing a visualization tool to competitors. The tool is packaged as an executable jar, which can be run either by double clicking it (in windows anyway) or from the command line as "java -jar Service.jar".

As in previous contests, to use this visualization tool, you should create an application that communicates with the tool via standard in and standard out. Note that this does not effect the way your program should work when you submit it on the TopCoder website. The program that you write for the visualizer should start by reading the parameters from standard input, one parameter per line. When reading integer arrays, the entire array will be given on a single line, with integers separated by spaces. The first integer on the line will N, the length of the array, which will then be followed by N integers denoting the array. When writing your result, you should write it in the same format as you read integer arrays (first length, then contents).

For instance, to use the visualizer, you might implement the following pseudocode, and adapt your solution to use it:

    
nextIntArray()
    len = nextInt()
    for(i = 0; i<len; i++)
        ret[i] = nextInt()
    return ret

main()
    x = nextIntArray();
    y = nextIntArray();
    serviceImportance = nextIntArray();
    serviceCost = nextIntArray();
    budget = nextInt();
    result = placeServices(x,y,serviceImportance,serviceCost,budget);
    print(length(result))
    for(i = 0; i<length(result); i++)
        print(' ')
        print(result[i])
    print('\n')
    flush(stdout)

Using the visualizer

To use the visualizer, you must have Java 1.5 or greater installed. To run the visualizer, you can execute the command "java -jar Service.jar". This will open up a new window containing the visualization, along with a number of controls. The first thing you will need to do is specify the executable you have made for your advertising code. You may either enter its path, or select it via the button provided. If your executable requires arguments, enter them in the provided field. For example, if your executable is a Java class ServiceFacilities.class, you should enter something like "java ServiceFacilities" (without the quotes) in this field (replacing "java" with the full path to the Java executable if necessary). The exact details of what you enter here will depend on your language choice. In particular, in Java, you will need to make sure that the class file is in the same directory as Service.jar, or else you will need to specify a classpath along with the executable location and class name.

You may customize the game by entering any values for the parameters that you like, and then clicking generate to make a test with those parameters. The field seed is a seed for the random number generator and will allow you to repeatedly generate the same test (note, however, that seed 0 means to use time as a seed). Clicking the "Generate Map" button will generate the map based on your parameters. Alternatively, you can select new random values for all parameters by clicking "New Parameters". If you've changed the seed, since you last generated a map, the seed you entered will be used to generate the parameters as well as the map, otherwise a new seed will be generated. To test the examples from the problem statement, you may simply enter the appropriate seeds and click "New Parameters".

When you run the simulation, any output you write to standard error, along with messages from the visualization tool will appear. After your result has been returned, you may change how you view it with the slider at top. This controls which of the services is currently being focused on, while the shades of grey in the display indicate the distance to the closest service of that type.

Command Line Options

You can specify a number of parameters on the command line to simplify the automation of testing (though you don't need to use any of them). For example, "java -jar Service.jar -N 50" will set N to 5 when running the tool.

-N <N>
-S <S>
-color <color>	Specify the service to focus on initially (set the slider at the top)
-seed <seed>	Specify the initial seed
-exec <command>	Specify the command to execute your code
-novis	Run the test case without the visualizer (requires -exec, implies -go)
-go	Start running immediately (requires -exec)
-onewindow	Run in one window instead of 3

Final Notes

Make sure you flush your buffers after writing to standard out, or the visualization tool might not get your output, and it will appear to hang.
Java users: if you get something java.lang.NoClassDefFoundError ServiceFacilities, it means that you've correctly set the path to Java, but Java can't find your class. Among other things, you can try setting the command to something like "PATH1\java -cp PATH2 ServiceFacilities", where PATH2 is the location of your class file.
If the simulation fails to go, but there are no error messages, the most likely explanation is that the visualization tool is still waiting for your program to tell it what to do next. An obvious cause for this is that your program is in some sort of an infinite loop. Another possible cause is that your program is waiting for input which it will never get, as the visualization tool is waiting for your program.
Please note that, while we will do our best to make the workings of the visualizer as clear as possible, it is impossible for us to help everyone debug their code to make it work with the visualization tool. If you do think you have discovered a bug, please email lbackstrom@topcoder.com or post the bug to the forums. The more details you provide, the more likely you are to be helped quickly. Please to NOT post code to the forums, as that is against the rules, and you will be disqualified.