Compilare: user.cpp:7:0: warning: "SIZE_MAX" redefined #define SIZE_MAX 20005 ^ In file included from /usr/lib/gcc/x86_64-linux-gnu/5/include/stdint.h:9:0, from /usr/include/c++/5/cstdint:41, from /usr/include/c++/5/bits/char_traits.h:420, from /usr/include/c++/5/ios:40, from /usr/include/c++/5/istream:38, from /usr/include/c++/5/fstream:38, from user.cpp:1: /usr/include/stdint.h:266:0: note: this is the location of the previous definition # define SIZE_MAX (4294967295U) ^ user.cpp: In function ‘void Din()’: user.cpp:41:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(unsigned i = 2; i <= poz; i++) ^