Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:11:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<L[nod].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:27:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<L[x].size();j++) ^