Compilare: main.cpp: In function 'int main()': main.cpp:90:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 90 | for (int i = 0; i < result.size(); i++) | ~~^~~~~~~~~~~~~~~ main.cpp: In member function 'std::vector<int> Graph::euler_cycle()': main.cpp:30:26: warning: control reaches end of non-void function [-Wreturn-type] 30 | vector<pair<int, int>> empty; | ^~~~~