Compilare: main.cpp: In function 'int main()': main.cpp:190:9: warning: unused variable 'minim' [-Wunused-variable] int minim,x; ^~~~~ main.cpp: In member function 'int Queue::get_first()': main.cpp:43:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In member function 'int Queue::get_first_index()': main.cpp:48:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In member function 'int Queue::get_last()': main.cpp:53:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In member function 'int Queue::get_last_index()': main.cpp:58:1: warning: control reaches end of non-void function [-Wreturn-type] } ^