Compilare: main.cpp: In member function 'void Graph::printGraph() const': main.cpp:32:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for (int i = 0; i < nodes.size(); ++i) { | ~~^~~~~~~~~~~~~~ main.cpp:38:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for (int i = 0; i < nodes.size(); ++i) { | ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:52:12: warning: unused variable 'j' [-Wunused-variable] 52 | int i, j, x, y, w; | ^