In file included from main.cpp:16:0:
set.h: In member function 'void Set::Add(int64_t)':
set.h:20:27: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
         for (int i = 0; i < this->v.size(); i++)
                         ~~^~~~~~~~~~~~~~~~
set.h: In member function 'void Set::Remove(int64_t)':
set.h:29:27: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
         for (int i = 0; i < this->v.size(); i++)
                         ~~^~~~~~~~~~~~~~~~
set.h: In member function 'bool Set::Contains(int64_t) const':
set.h:37:27: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
         for (int i = 0; i < this->v.size(); i++)
                         ~~^~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors