Compilare: user.cpp: In function ‘void build(int)’: user.cpp:17:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) ^ user.cpp: In function ‘void sterg(int, int, int)’: user.cpp:29:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) ^