Compilare: user.cpp: In member function ‘int Heap::best_ind(int)’: user.cpp:91:10: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] if (ind << 1 + 1 < Elems.size()) ^ user.cpp:91:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ind << 1 + 1 < Elems.size()) ^ user.cpp: In member function ‘void Heap::del_elem()’: user.cpp:107:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ind << 1 < Elems.size()) ^