Compilare: In file included from /usr/include/c++/4.8/backward/hash_map:60:0, from user.cpp:2: /usr/include/c++/4.8/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 member function ‘bool clascom::operator()(const string&, const string&)’: user.cpp:32:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); ++i) ^ user.cpp: In function ‘void upAib(int)’: user.cpp:54:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; x <= v.size(); x += x & -x) ^ user.cpp: In function ‘int que(int)’: user.cpp:62:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i + step <= v.size() && aib[i + step] <= k ) { ^