Eroare de compilare: user.cpp: In function ‘void df(int)’: user.cpp:30:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[x].size(); ++i) ^ user.cpp: In function ‘void sons(int&, int)’: user.cpp:41:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[curr].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:130:17: error: expected primary-expression before ‘else’ else ^ user.cpp:130:17: error: expected ‘;’ before ‘else’