Compilare: user.cpp: In function ‘void df1(int)’: user.cpp:14:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nod].size();i++) ^ user.cpp:11:9: warning: unused variable ‘val’ [-Wunused-variable] int vl,val; ^ user.cpp: In function ‘void df2(int)’: user.cpp:35:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nod].size();i++) ^ user.cpp:32:9: warning: unused variable ‘val’ [-Wunused-variable] int vl,val; ^ user.cpp: In function ‘int main()’: user.cpp:84:7: warning: ‘minim’ may be used uninitialized in this function [-Wmaybe-uninitialized] o<<minim<<" "<<nr<<endl; ^