Compilare: user.cpp: In function 'int main()': user.cpp:27: warning: comparison between signed and unsigned integer expressions user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp:36: warning: comparison between signed and unsigned integer expressions user.cpp:42: warning: comparison between signed and unsigned integer expressions user.cpp:20: warning: unused variable 'hmax' user.cpp:25: warning: unused variable 'max'