Compilare: user.cpp: In instantiation of ‘void _erase(Type*&, KType) [with Type = treap2; KType = Key2]’: user.cpp:290:47: required from here user.cpp:261:11: warning: unused variable ‘crt’ [-Wunused-variable] Type *crt = new Type(k); ^~~ user.cpp: In instantiation of ‘void _erase(Type*&, KType) [with Type = treap2; KType = int]’: user.cpp:300:54: required from here user.cpp:261:11: warning: unused variable ‘crt’ [-Wunused-variable] user.cpp: In instantiation of ‘void _erase(Type*&, KType) [with Type = treap; KType = Key]’: user.cpp:301:35: required from here user.cpp:261:11: warning: unused variable ‘crt’ [-Wunused-variable] user.cpp: In member function ‘void treap::update()’: user.cpp:138:9: warning: nonnull argument ‘this’ compared to NULL [-Wnonnull-compare] if (!this) return; ^~ user.cpp: In member function ‘void treap2::update()’: user.cpp:76:9: warning: nonnull argument ‘this’ compared to NULL [-Wnonnull-compare] if (!this) return; ^~