Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:38:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (it=0;it<G[nod].size();it++) ^ user.cpp: In function ‘int main()’: user.cpp:65:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol.size()-1;i++) g<<sol[i]<<' '; ^