foo.cc: In member function 'void gjd::Add(std::vector<int>&)':
foo.cc:34:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |   while(i<v.size()&&i<v2.size())
      |         ~^~~~~~~~~
foo.cc:34:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |   while(i<v.size()&&i<v2.size())
      |                     ~^~~~~~~~~~
foo.cc:41:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |   while(i<v.size())
      |         ~^~~~~~~~~
foo.cc:48:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |   while(i<v2.size())
      |         ~^~~~~~~~~~
foo.cc: In member function 'void gjd::Mul(int)':
foo.cc:64:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |   while(i<v.size())
      |         ~^~~~~~~~~

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