Eroare de compilare: user.cpp: In function ‘void euler(int)’: user.cpp:12:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<graph[vertex].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:31:51: error: no matching function for call to ‘make_pair(int&, int&)’ graph[x].push_back(std::make_pair<int, int>(y, i)); ^ user.cpp:31:51: note: candidate is: 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/fstream:38, from user.cpp:1: /usr/include/c++/4.8/bits/stl_pair.h:276:5: note: template<class _T1, class _T2> constexpr std::pair<typename std::__decay_and_strip<_Tp>::__type, typename std::__decay_and_strip<_T2>::__type> std::make_pair(_T1&&, _T2&&) make_pair(_T1&& __x, _T2&& __y) ^ /usr/include/c++/4.8/bits/stl_pair.h:276:5: note: template argument deduction/substitution failed: user.cpp:31:51: note: cannot convert ‘y’ (type ‘int’) to type ‘int&&’ graph[x].push_back(std::make_pair<int, int>(y, i)); ^ user.cpp:32:51: error: no matching function for call to ‘make_pair(int&, int&)’ graph[y].push_back(std::make_pair<int, int>(x, i)); ^ user.cpp:32:51: note: candidate is: 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/fstream:38, from user.cpp:1: /usr/include/c++/4.8/bits/stl_pair.h:276:5: note: template<class _T1, class _T2> constexpr std::pair<typename std::__decay_and_strip<_Tp>::__type, typename std::__decay_and_strip<_T2>::__type> std::make_pair(_T1&&, _T2&&) make_pair(_T1&& __x, _T2&& __y) ^ /usr/include/c++/4.8/bits/stl_pair.h:276:5: note: template argument deduction/substitution failed: user.cpp:32:51: note: cannot convert ‘x’ (type ‘int’) to type ‘int&&’ graph[y].push_back(std::make_pair<int, int>(x, i)); ^ user.cpp:41:54: error: no matching function for call to ‘make_pair(int&, int&)’ graph[0].push_back(std::make_pair<int, int>(i, ++k)); ^ user.cpp:41:54: note: candidate is: 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/fstream:38, from user.cpp:1: /usr/include/c++/4.8/bits/stl_pair.h:276:5: note: template<class _T1, class _T2> constexpr std::pair<typename std::__decay_and_strip<_Tp>::__type, typename std::__decay_and_strip<_T2>::__type> std::make_pair(_T1&&, _T2&&)