- std::set<int> tmp,newElementsToDo;
- std::set_difference(zeCandidates.begin(),zeCandidates.end(),elemsDone.begin(),elemsDone.end(),std::inserter(tmp,tmp.begin()));
- std::set_union(elemsToDo.begin(),elemsToDo.end(),tmp.begin(),tmp.end(),std::inserter(newElementsToDo,newElementsToDo.begin()));
+ std::set<int> tmp2,newElementsToDo;
+ std::set_difference(zeCandidates.begin(),zeCandidates.end(),elemsDone.begin(),elemsDone.end(),std::inserter(tmp2,tmp2.begin()));
+ std::set_union(elemsToDo.begin(),elemsToDo.end(),tmp2.begin(),tmp2.end(),std::inserter(newElementsToDo,newElementsToDo.begin()));