Compilare: user.cpp: In function ‘bool check_connectivity(int)’: user.cpp:24:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graph[y].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:104:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < eulerList.size(); i++) ^