Compilare: main.cpp: In member function 'pairingHeap<type>* pairingHeap<type>::merge(pairingHeap<type>*) [with type = int]': main.cpp:34:5: warning: 'nonnull' argument 'this' compared to NULL [-Wnonnull-compare] 34 | if(this == NULL) | ^~ main.cpp: In member function 'type pairingHeap<type>::removeMax() [with type = int]': main.cpp:74:5: warning: 'nonnull' argument 'this' compared to NULL [-Wnonnull-compare] 74 | if(this == NULL) | ^~