Compilare: main.cpp: In member function 'std::vector<int>& Graph::operator[](int)': main.cpp:30:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | if(index > this->adjList.size() || index < 0){ | ~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'void Solution::Ghizi()': main.cpp:190:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 190 | for(int i = 0; i < vol.size(); ++i){ | ~~^~~~~~~~~~~~ main.cpp: In member function 'std::vector<int>& Graph::operator[](int)': main.cpp:37:9: warning: control reaches end of non-void function [-Wreturn-type] 37 | } | ^