Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:11:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<a[nod].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:34:29: warning: for increment expression has no effect [-Wunused-value] for(i=fin.size()-1;i>=0;i) ^