foo.cc: In member function 'void gjd::Add(std::vector<int>&)':
foo.cc:35:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         while(i<v.size()&&i<v2.size())
               ~^~~~~~~~~
foo.cc:35:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         while(i<v.size()&&i<v2.size())
                           ~^~~~~~~~~~
foo.cc:42:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         while(i<v.size())
               ~^~~~~~~~~
foo.cc:49:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         while(i<v2.size())
               ~^~~~~~~~~~
foo.cc: In member function 'void gjd::Sub(std::vector<int>)':
foo.cc:65:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         while(i<v.size()&&i<v1.size())
               ~^~~~~~~~~
foo.cc:65:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         while(i<v.size()&&i<v1.size())
                           ~^~~~~~~~~~
foo.cc: In member function 'void gjd::Mul(int)':
foo.cc:85:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         while(i<v.size())
               ~^~~~~~~~~

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