Compilare: user.cpp: In function ‘void get_time_nr(size_t)’: user.cpp:21:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = pos; i <= pos + 3; i++) ^ user.cpp:20:9: warning: unused variable ‘nr’ [-Wunused-variable] int nr = 0; ^ user.cpp: In function ‘void gettimes()’: user.cpp:34:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = pos+1; i <= pos + 3; i++) ^