Compilare: In file included from /usr/local/include/c++/4.8.0/backward/hash_map:60:0, from user.cpp:4: /usr/local/include/c++/4.8.0/backward/backward_warning.h:32:2: warning: #warning This file includes at least one deprecated or antiquated header which may be removed without further notice at a future date. Please use a non-deprecated interface with equivalent functionality instead. For a listing of replacement headers and interfaces, consult the file backward_warning.h. To disable this warning use -Wno-deprecated. [-Wcpp] #warning \ ^ user.cpp: In function ‘int main()’: user.cpp:115:18: warning: variable ‘distincts’ set but not used [-Wunused-but-set-variable] unsigned int distincts = 0; ^ user.cpp:116:9: warning: variable ‘span’ set but not used [-Wunused-but-set-variable] int span = 1; ^