Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:31:18: error: no matching function for call to ‘std::map<int, int>::erase(std::pair<const int, int>&)’ mymap.erase(it); ^ user.cpp:31:18: note: candidates are: In file included from /usr/include/c++/4.8/map:61:0, from user.cpp:6: /usr/include/c++/4.8/bits/stl_map.h:690:7: note: std::map<_Key, _Tp, _Compare, _Alloc>::iterator std::map<_Key, _Tp, _Compare, _Alloc>::erase(std::map<_Key, _Tp, _Compare, _Alloc>::const_iterator) [with _Key = int; _Tp = int; _Compare = std::less<int>; _Alloc = std::allocator<std::pair<const int, int> >; std::map<_Key, _Tp, _Compare, _Alloc>::iterator = std::_Rb_tree_iterator<std::pair<const int, int> >; std::map<_Key, _Tp, _Compare, _Alloc>::const_iterator = std::_Rb_tree_const_iterator<std::pair<const int, int> >] erase(const_iterator __position) ^ /usr/include/c++/4.8/bits/stl_map.h:690:7: note: no known conversion for argument 1 from ‘std::pair<const int, int>’ to ‘std::map<int, int>::const_iterator {aka std::_Rb_tree_const_iterator<std::pair<const int, int> >}’ /usr/include/c++/4.8/bits/stl_map.h:695:7: note: std::map<_Key, _Tp, _Compare, _Alloc>::iterator std::map<_Key, _Tp, _Compare, _Alloc>::erase(std::map<_Key, _Tp, _Compare, _Alloc>::iterator) [with _Key = int; _Tp = int; _Compare = std::less<int>; _Alloc = std::allocator<std::pair<const int, int> >; std::map<_Key, _Tp, _Compare, _Alloc>::iterator = std::_Rb_tree_iterator<std::pair<const int, int> >] erase(iterator __position) ^ /usr/include/c++/4.8/bits/stl_map.h:695:7: note: no known conversion for argument 1 from ‘std::pair<const int, int>’ to ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ /usr/include/c++/4.8/bits/stl_map.h:725:7: note: std::map<_Key, _Tp, _Compare, _Alloc>::size_type std::map<_Key, _Tp, _Compare, _Alloc>::erase(const key_type&) [with _Key = int; _Tp = int; _Compare = std::less<int>; _Alloc = std::allocator<std::pair<const int, int> >; std::map<_Key, _Tp, _Compare, _Alloc>::size_type = unsigned int; std::map<_Key, _Tp, _Compare, _Alloc>::key_type = int] erase(const key_type& __x) ^ /usr/include/c++/4.8/bits/stl_map.h:725:7: note: no known conversion for argument 1 from ‘std::pair<const int, int>’ to ‘const key_type& {aka const int&}’ /usr/include/c++/4.8/bits/stl_map.h:745:7: note: std::map<_Key, _Tp, _Compare, _Alloc>::iterator std::map<_Key, _Tp, _Compare, _Alloc>::erase(std::map<_Key, _Tp, _Compare, _Alloc>::const_iterator, std::map<_Key, _Tp, _Compare, _Alloc>::const_iterator) [with _Key = int; _Tp = int; _Compare = std::less<int>; _Alloc = std::allocator<std::pair<const int, int> >; std::map<_Key, _Tp, _Compare, _Alloc>::iterator = std::_Rb_tree_iterator<std::pair<const int, int> >; std::map<_Key, _Tp, _Compare, _Alloc>::const_iterator = std::_Rb_tree_const_iterator<std::pair<const int, int> >] erase(const_iterator __first, const_iterator __last) ^ /usr/include/c++/4.8/bits/stl_map.h:745:7: note: candidate expects 2 arguments, 1 provided user.cpp:33:6: error: redeclaration of ‘int ans’ int ans = -1; ^ user.cpp:24:6: error: ‘int ans’ previously declared here int ans = 0; ^ user.cpp:37:2: error: expected ‘;’ before ‘fout’ fout << ans + (mymap.size() != 1) << '\n'; ^