Compilare: main.cpp: In function 'std::vector<int> din(int)': main.cpp:27:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i != v[node].size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:60:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i != ans.size(); i++) ~~^~~~~~~~~~~~~