An experiment with increasing number of caves by selecting a few potential non-cave maps and adding to the cave map array. Ones selected here might not actually be that playable as caves.
#include <QApplication>
#include "mainform.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MyWindow *mainWin = new MyWindow;
mainWin->show();
return app.exec();
}