Eroare de compilare: user.cpp: In function ‘int solve()’: user.cpp:43:57: error: conversion from ‘std::unordered_set<int>::iterator {aka std::__detail::_Node_iterator<int, true, false>}’ to non-scalar type ‘std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}’ requested for(set < int > :: iterator it = A[k].begin(); it != A[k].end(); ++it) { ^ user.cpp:43:63: error: no match for ‘operator!=’ (operand types are ‘std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}’ and ‘std::unordered_set<int>::iterator {aka std::__detail::_Node_iterator<int, true, false>}’) for(set < int > :: iterator it = A[k].begin(); it != A[k].end(); ++it) { ^ user.cpp:43:63: note: candidates are: In file included from /usr/include/c++/4.8/map:60:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:80, from user.cpp:1: /usr/include/c++/4.8/bits/stl_tree.h:302:7: 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/include/c++/4.8/bits/stl_tree.h:302:7: note: no known conversion for argument 1 from ‘std::unordered_set<int>::iterator {aka std::__detail::_Node_iterator<int, true, false>}’ to ‘const _Self& {aka const std::_Rb_tree_const_iterator<int>&}’ In file included from /usr/include/c++/4.8/iosfwd:40:0, from /usr/include/c++/4.8/ios:38, from /usr/include/c++/4.8/istream:38, from /usr/include/c++/4.8/sstream:38, from /usr/include/c++/4.8/complex:45, from /usr/include/c++/4.8/ccomplex:38, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52, from user.cpp:1: /usr/include/c++/4.8/bits/postypes.h:221:5: 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/include/c++/4.8/bits/postypes.h:221:5: note: template argument deduction/substitution failed: user.cpp:43:75: note: ‘std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}’ is not derived from ‘const std::fpos<_StateT>’ for(set < int > :: iterator it = A[k].begin(); it != A[k].end(); ++it) { ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:64:0, from /usr/include/c++/4.8/bits/char_traits.h:39, from /usr/include/c++/4.8/ios:40, from /usr/include/c++/4.8/istream:38, from /usr/include/c++/4.8/sstream:38, from /usr/include/c++/4.8/complex:45, from /usr/include/c++/4.8/ccomplex:38, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52, from user.cpp:1: /usr/include/c++/4.8/bits/stl_pair.h:227:5: 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/include/c++/4.8/bits/stl_pair.h:227:5: note: template argument deduction/substitution failed: user.cpp:43:75: note: ‘std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}’ is not derived from ‘const std::pair<_T1, _T2>’ for(set < int > :: iterator it = A[k].begin(); it != A[k].end(); ++it) { ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0, from /usr/include/c++/4.8/bits/char_traits.h:39, from /usr/include/c++/4.8/ios:40, from /usr/include/c++/4.8/istream:38,