Compilare: user.cpp: In function ‘int main()’: user.cpp:57:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<keys.size();i++) ^ user.cpp:103:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<values.size();i++) ^ user.cpp:107:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(counter==keys.size()) ^ user.cpp:17:8: warning: variable ‘number_of_values’ set but not used [-Wunused-but-set-variable] int number_of_values=0; ^ user.cpp:19:12: warning: unused variable ‘pos’ [-Wunused-variable] size_t pos=0; ^ user.cpp:106:24: warning: ‘counter’ may be used uninitialized in this function [-Wmaybe-uninitialized] counter++; ^