Compilare: main.cpp: In member function 'int RedBlackTree::max(node*, int)': main.cpp:235:16: warning: converting to non-pointer type 'int' from NULL [-Wconversion-null] 235 | return NULL; | ^~~~ main.cpp:241:18: warning: NULL used in arithmetic [-Wpointer-arith] 241 | if (k == NULL) | ^~~~ main.cpp: In member function 'int RedBlackTree::min(node*, int)': main.cpp:255:16: warning: converting to non-pointer type 'int' from NULL [-Wconversion-null] 255 | return NULL; | ^~~~ main.cpp: In member function 'int RedBlackTree::max(node*, int)': main.cpp:249:1: warning: control reaches end of non-void function [-Wreturn-type] 249 | } | ^ main.cpp: In member function 'int RedBlackTree::min(node*, int)': main.cpp:266:1: warning: control reaches end of non-void function [-Wreturn-type] 266 | } | ^