Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
the wrong way
for(auto it=l.cbegin(); it!=l.cend(); ++it){
for(auto jt=++it; jt!=l.cend(); ++jt){
cout << *it << " <-> " << *jt << endl;
}
}it is increased again in the inner loop!!!
the correct way
for(auto it=l.cbegin(); it!=l.cend(); ++it){
for(auto jt=next(it); jt!=l.cend(); ++jt){
cout << *it << " <-> " << *jt << endl;
}
}it is very tricky to iterate a container and delete elements blog about it