I don't see how rating these against others is useful, given the limited radius, and the cluster bomb thing just seems counterproductive. Anyway, this prevents AI from picking on barrels.

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#include <QtGui/QApplication>

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#include "mainwindow.h"

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int main(int argc, char *argv[])

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{

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    QApplication a(argc, argv);

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    MainWindow w;

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    w.show();

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    return a.exec();

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}