Compilare: user.cpp: In function ‘void bfs(const int&)’: user.cpp:19:6: warning: unused variable ‘d’ [-Wunused-variable] int d = 0; v[x] = 1; short c; ^ user.cpp: In function ‘int main()’: user.cpp:47:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < Rec.size(); ++j) of << Rec[j] << " "; ^