/in/foo.cc: In constructor 'Bignum::FFTer::FFTer(std::vector<int>&)':
/in/foo.cc:106:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int i = 0; i < vec.size(); i++)
                            ~~^~~~~~~~~~~~
/in/foo.cc: In member function 'void Bignum::maintain()':
/in/foo.cc:257:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i = 0; i < bits.size(); i++)
                        ~~^~~~~~~~~~~~~
/in/foo.cc:259:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(i + 1 < bits.size())
                ~~~~~~^~~~~~~~~~~~~
/in/foo.cc: In member function 'Bignum& Bignum::divto2()':
/in/foo.cc:480:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(i = 1; i < bits.size(); i++)
                    ~~^~~~~~~~~~~~~