foo.cc: In copy constructor 'HighInt::HighInt(const HighInt&)':
foo.cc:19:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |                 for(int i=0;i<other.data.size();i++)
      |                             ~^~~~~~~~~~~~~~~~~~
foo.cc: In member function 'HighInt HighInt::operator+(const HighInt&)':
foo.cc:26:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |                 for (int i = 0; i < data.size()||i<other.data.size(); i++)
      |                                 ~~^~~~~~~~~~~~~
foo.cc:26:51: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |                 for (int i = 0; i < data.size()||i<other.data.size(); i++)
      |                                                  ~^~~~~~~~~~~~~~~~~~
foo.cc:28:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |                         if(i<data.size()) t+=data[i];
      |                            ~^~~~~~~~~~~~
foo.cc:29:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |                         if(i<other.data.size()) t+=other.data[i];
      |                            ~^~~~~~~~~~~~~~~~~~
foo.cc: In member function 'Im HighInt::sub(Im&, Im&)':
foo.cc:60:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |                 for(int i=0,t=0;i<A.size();i++)
      |                                 ~^~~~~~~~~
foo.cc:63:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |                         if (i<B.size()) t-=B[i];
      |                             ~^~~~~~~~~
foo.cc: In function 'HighInt operator*(const HighInt&, int)':
foo.cc:91:45: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |                 for (long long i = 0,t=0; i < A.data.size()||t; i++)
      |                                           ~~^~~~~~~~~~~~~~~
foo.cc:93:29: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   93 |                         if(i<A.data.size())
      |                            ~^~~~~~~~~~~~~~

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