/in/foo.cc: In function 'HugeInt operator+(HugeInt, HugeInt)':
/in/foo.cc:99:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=0;i<B.f.size();i++)
                ~^~~~~~~~~~~
/in/foo.cc:105:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=B.f.size();i<A.f.size();i++)
                         ~^~~~~~~~~~~
/in/foo.cc: In function 'HugeInt operator-(HugeInt, HugeInt)':
/in/foo.cc:124:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<B.f.size();i++)
                 ~^~~~~~~~~~~
/in/foo.cc:136:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<A.f.size();i++)
                 ~^~~~~~~~~~~
/in/foo.cc: In function 'HugeInt operator*(HugeInt, HugeInt)':
/in/foo.cc:156:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=0;i<A.f.size();i++)
                ~^~~~~~~~~~~
/in/foo.cc:157:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int j=0;j<B.f.size();j++)
                 ~^~~~~~~~~~~