Compilare: user.cpp: In member function ‘void Heap::print()’: user.cpp:50:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <heap.size() ; i++) ^ user.cpp:53:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <heap.size(); i++) ^ user.cpp: In member function ‘void Heap::update(int, int)’: user.cpp:72:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i<heap.size(); i++) ^