Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:14:31: 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:50:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<sol[i].size();j++) ^