Compilare: main.cpp: In member function 'std::vector<int> Graph::getTopologicalSort()': main.cpp:154:23: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'const int' [-Wsign-compare] 154 | return result.size() == N_NODES ? result : std::vector<int>(); // if cycle => empty | ~~~~~~~~~~~~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:416:13: warning: unused variable 'c' [-Wunused-variable] 416 | int x, y, c; | ^