Compilare: user.cpp: In function ‘void build(int)’: user.cpp:16:27: 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)’: user.cpp:28:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:108:19: warning: ‘nod’ may be used uninitialized in this function [-Wmaybe-uninitialized] sterg(nod); ^