Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:18:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:81:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;(int)i<sol.size();++i) ^