Compilare: main.cpp: In function 'std::vector<int> top_sorting(int, std::vector<std::vector<int> >&, std::vector<int>&)': main.cpp:35:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < inDegree.size(); ++i){ ~~^~~~~~~~~~~~~~~~~ main.cpp:46:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < adj[u].size(); ++i){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:67:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sorted.size(); ++i) ~~^~~~~~~~~~~~~~~