Does the following Qt code have memory leaks?

I Love Programming
1

I’m confused about Qt parent objects deletion.

#include <QApplication>
#include <QPushButton>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QWidget>
#include <QLabel>

int main(int argc, char* argv[]) {
   QApplication app(argc, argv);

   QWidget *window = new QWidget;
   QLabel* label1 = new QLabel("Greetings");
   QPushButton* button1 = new QPushButton("One");
   QPushButton* button2 = new QPushButton("Two");
   QPushButton* button3 = new QPushButton("Three");
   QPushButton* button4 = new QPushButton("Four");
   QPushButton* button5 = new QPushButton("Five");

   QVBoxLayout* vlayout = new QVBoxLayout(window);
   vlayout->addWidget(label1, 0, Qt::AlignCenter);
   QHBoxLayout* hlayout = new QHBoxLayout();
   hlayout->addWidget(button1);
   hlayout->addWidget(button2);
   hlayout->addWidget(button3);
   hlayout->addWidget(button4);
   hlayout->addWidget(button5);
   vlayout->addLayout(hlayout);

   window->show();
   return QApplication::exec();
}