Eroare de compilare: main.cpp: In function 'int main()': main.cpp:53:43: error: no match for 'operator==' (operand types are 'std::multiset<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' and 'int') if (s.find(a[ind] + a[j]) == 0) stop = true; ~~~~~~~~~~~~~~~~~~~~~~^~~~ In file included from /usr/include/c++/6/set:60:0, from main.cpp:10: /usr/include/c++/6/bits/stl_tree.h:316:7: note: candidate: 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 _GLIBCXX_NOEXCEPT ^~~~~~~~ /usr/include/c++/6/bits/stl_tree.h:316:7: note: no known conversion for argument 1 from 'int' to 'const _Self& {aka const std::_Rb_tree_const_iterator<int>&}' In file included from /usr/include/c++/6/utility:70:0, from /usr/include/c++/6/algorithm:60, from main.cpp:2: /usr/include/c++/6/bits/stl_pair.h:435:5: note: candidate: 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++/6/bits/stl_pair.h:435:5: note: template argument deduction/substitution failed: main.cpp:53:46: note: 'std::multiset<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' is not derived from 'const std::pair<_T1, _T2>' if (s.find(a[ind] + a[j]) == 0) stop = true; ^ In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0, from /usr/include/c++/6/algorithm:61, from main.cpp:2: /usr/include/c++/6/bits/stl_iterator.h:292:5: note: candidate: template<class _Iterator> bool 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:292:5: note: template argument deduction/substitution failed: main.cpp:53:46: note: 'std::multiset<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' is not derived from 'const std::reverse_iterator<_Iterator>' if (s.find(a[ind] + a[j]) == 0) stop = true; ^ In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0, from /usr/include/c++/6/algorithm:61, from main.cpp:2: /usr/include/c++/6/bits/stl_iterator.h:349:5: note: candidate: template<class _IteratorL, class _IteratorR> bool 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:349:5: note: template argument deduction/substitution failed: main.cpp:53:46: note: 'std::multiset<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' is not derived from 'const std::reverse_iterator<_Iterator>' if (s.find(a[ind] + a[j]) == 0) stop = true; ^ In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0, from /usr/include/c++/6/algorithm:61, from main.cpp:2: /usr/include/c++/6/bits/stl_iterator.h:1113:5: note: candidate: template<class _IteratorL, class _IteratorR> bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&) operator==(const move_iterator<_IteratorL>& __x, ^~~~~~~~ /usr/include/c++/6/bits/stl_iterator.h:1113:5: note: template argument deduction/substitution failed: main.cpp:53:46: note: 'std::multiset<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' is not derived from 'const std::move_iterator<_IteratorL>' if (s.find(a[ind] + a[j]) == 0) stop = true; ^ Non zero exit status: 1