Compilare: user.cpp: In function ‘void back(int, int (*)[10], int, int)’: user.cpp:77:45: warning: argument to ‘sizeof’ in ‘void* memcpy(void*, const void*, size_t)’ call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess] memcpy(D, D2, sizeof(D)); ^