Compilare: user.cpp: In function ‘int main()’: user.cpp:69: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x user.cpp:70: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x user.cpp:79: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x user.cpp:86: warning: comparison between signed and unsigned integer expressions