Compilare: main.cpp:11: warning: "NULL" redefined 11 | #define NULL -1 | In file included from /usr/include/stdio.h:33, from /usr/include/c++/10/cstdio:42, from /usr/include/c++/10/ext/string_conversions.h:43, from /usr/include/c++/10/bits/basic_string.h:6545, from /usr/include/c++/10/string:55, from /usr/include/c++/10/bits/locale_classes.h:40, from /usr/include/c++/10/bits/ios_base.h:41, from /usr/include/c++/10/ios:42, from /usr/include/c++/10/ostream:38, from /usr/include/c++/10/iostream:39, from main.cpp:1: /usr/lib/gcc/x86_64-linux-gnu/10/include/stddef.h:392: note: this is the location of the previous definition 392 | #define NULL __null |