Compilare: main.cpp: In function 'int main()': main.cpp:134:13: warning: unused variable 'j' [-Wunused-variable] 134 | int n,i,j,k,nr; | ^ main.cpp: In member function 'std::pair<int, int> Eduard_Deque::back_element()': main.cpp:128:5: warning: control reaches end of non-void function [-Wreturn-type] 128 | } | ^ main.cpp: In member function 'std::pair<int, int> Eduard_Deque::front_element()': main.cpp:122:5: warning: control reaches end of non-void function [-Wreturn-type] 122 | } | ^