The following steps can be removed.
QList<QString> sss ;
sss.append("1");
sss.append("2");
sss.append("3");
sss.append("1");
QList<QString> aaa = sss.toSet().toList() ;
The following steps can be removed.
QList<QString> sss ;
sss.append("1");
sss.append("2");
sss.append("3");
sss.append("1");
QList<QString> aaa = sss.toSet().toList() ;