Compilare: main.cpp: In member function 'bool Graph::is_correct_graph(std::vector<int>)': main.cpp:43:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | if(v>grade.size()) | ~^~~~~~~~~~~~~ main.cpp: In member function 'void Directed::findCTC()': main.cpp:166:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 166 | for(int i=0;i<sol.size();i++) | ~^~~~~~~~~~~ main.cpp:168:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 168 | for(int j=0;j<sol[i].size();j++) | ~^~~~~~~~~~~~~~