Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:31:26: error: no match for ‘operator==’ (operand types are ‘std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}’ and ‘bool’) if(A.find(X) ==true) ^ user.cpp:31:26: note: candidates are: In file included from /usr/local/include/c++/4.8.0/set:60:0, from user.cpp:2: /usr/local/include/c++/4.8.0/bits/stl_tree.h:298:7: note: bool std::_Rb_tree_const_iterator<_Tp>::operator==(const _Self&) const [with _Tp = int; std::_Rb_tree_const_iterator<_Tp>::_Self = std::_Rb_tree_const_iterator<int>] operator==(const _Self& __x) const ^ /usr/local/include/c++/4.8.0/bits/stl_tree.h:298:7: note: no known conversion for argument 1 from ‘bool’ to ‘const _Self& {aka const std::_Rb_tree_const_iterator<int>&}’ In file included from /usr/local/include/c++/4.8.0/iosfwd:40:0, from /usr/local/include/c++/4.8.0/ios:38, from /usr/local/include/c++/4.8.0/istream:38, from /usr/local/include/c++/4.8.0/fstream:38, from user.cpp:1: /usr/local/include/c++/4.8.0/bits/postypes.h:216:5: note: template<class _StateT> bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&) operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs) ^ /usr/local/include/c++/4.8.0/bits/postypes.h:216:5: note: template argument deduction/substitution failed: user.cpp:31:28: note: ‘std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}’ is not derived from ‘const std::fpos<_StateT>’ if(A.find(X) ==true) ^ In file included from /usr/local/include/c++/4.8.0/bits/stl_algobase.h:64:0, from /usr/local/include/c++/4.8.0/bits/char_traits.h:39, from /usr/local/include/c++/4.8.0/ios:40, from /usr/local/include/c++/4.8.0/istream:38, from /usr/local/include/c++/4.8.0/fstream:38, from user.cpp:1: /usr/local/include/c++/4.8.0/bits/stl_pair.h:214:5: note: template<class _T1, class _T2> constexpr bool std::operator==(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&) operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) ^ /usr/local/include/c++/4.8.0/bits/stl_pair.h:214:5: note: template argument deduction/substitution failed: user.cpp:31:28: note: ‘std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}’ is not derived from ‘const std::pair<_T1, _T2>’ if(A.find(X) ==true) ^ In file included from /usr/local/include/c++/4.8.0/bits/stl_algobase.h:67:0, from /usr/local/include/c++/4.8.0/bits/char_traits.h:39, from /usr/local/include/c++/4.8.0/ios:40, from /usr/local/include/c++/4.8.0/istream:38, from /usr/local/include/c++/4.8.0/fstream:38, from user.cpp:1: /usr/local/include/c++/4.8.0/bits/stl_iterator.h:291:5: note: template<class _Iterator> bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&) operator==(const reverse_iterator<_Iterator>& __x, ^ /usr/local/include/c++/4.8.0/bits/stl_iterator.h:291:5: note: template argument deduction/substitution failed: user.cpp:31:28: note: ‘std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}’ is not derived from ‘const std::reverse_iterator<_Iterator>’ if(A.find(X) ==true) ^ In file included from /usr/local/include/c++/4.8.0/bits/stl_algobase.h:67:0,