foo.cc: In member function 'void gjd::Add(std::vector<int>&)':
foo.cc:9:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(i<v.size()&&i<v2.size())
         ~^~~~~~~~~
foo.cc:9:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(i<v.size()&&i<v2.size())
                     ~^~~~~~~~~~
foo.cc:16:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(i<v.size())
         ~^~~~~~~~~
foo.cc:23:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(i<v2.size())
         ~^~~~~~~~~~
foo.cc: In member function 'void gjd::Mul(int)':
foo.cc:39:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(i<v.size())
         ~^~~~~~~~~
foo.cc: In member function 'int gjd::everyMul()':
foo.cc:55:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.size();i++)
               ~^~~~~~~~~
foo.cc: In member function 'bool gjd::same(std::vector<int>&)':
foo.cc:75:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.size();i++)
               ~^~~~~~~~~

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