Eroare de compilare: main.cpp: In function 'int sterge(std::set<int>&, int)': main.cpp:50:13: error: 'PQ' was not declared in this scope PQ.push(pereche(*it1, *it2));//formez perechea ^~ main.cpp: In function 'int max_dif(std::set<int>&)': main.cpp:78:62: error: no match for 'operator-' (operand types are 'std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' and 'int') set<int>::iterator prim = Z.begin(), ultim = Z.end() - 1; ~~~~~~~~^~~ In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0, from /usr/include/c++/6/bits/char_traits.h:39, from /usr/include/c++/6/ios:40, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/sstream:38, from /usr/include/c++/6/complex:45, from /usr/include/c++/6/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52, from main.cpp:1: /usr/include/c++/6/bits/stl_iterator.h:333:5: note: candidate: template<class _Iterator> decltype ((__x.base() - __y.base())) std::operator-(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&) operator-(const reverse_iterator<_Iterator>& __x, ^~~~~~~~ /usr/include/c++/6/bits/stl_iterator.h:333:5: note: template argument deduction/substitution failed: main.cpp:78:64: note: 'std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' is not derived from 'const std::reverse_iterator<_Iterator>' set<int>::iterator prim = Z.begin(), ultim = Z.end() - 1; ^ In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0, from /usr/include/c++/6/bits/char_traits.h:39, from /usr/include/c++/6/ios:40, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/sstream:38, from /usr/include/c++/6/complex:45, from /usr/include/c++/6/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52, from main.cpp:1: /usr/include/c++/6/bits/stl_iterator.h:387:5: note: candidate: template<class _IteratorL, class _IteratorR> decltype ((__y.base() - __x.base())) std::operator-(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&) operator-(const reverse_iterator<_IteratorL>& __x, ^~~~~~~~ /usr/include/c++/6/bits/stl_iterator.h:387:5: note: template argument deduction/substitution failed: main.cpp:78:64: note: 'std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' is not derived from 'const std::reverse_iterator<_Iterator>' set<int>::iterator prim = Z.begin(), ultim = Z.end() - 1; ^ In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0, from /usr/include/c++/6/bits/char_traits.h:39, from /usr/include/c++/6/ios:40, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/sstream:38, from /usr/include/c++/6/complex:45, from /usr/include/c++/6/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52, from main.cpp:1: /usr/include/c++/6/bits/stl_iterator.h:1186:5: note: candidate: template<class _IteratorL, class _IteratorR> decltype ((__x.base() - __y.base())) std::operator-(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&) Non zero exit status: 1