foo.cc: In member function 'BigInt BigInt::operator+(const BigInt&)':
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 'Iv BigInt::sub(Iv&, Iv&)':
foo.cc:50:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |                 for(int i=0,t=0;i<A.size();i++)
      |                                 ~^~~~~~~~~
foo.cc:53:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |                         if (i<B.size()) t-=B[i];
      |                             ~^~~~~~~~~
foo.cc: In function 'BigInt operator*(const BigInt&, int)':
foo.cc:81:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   81 |                 for (int i = 0,t=0; i < A.data.size()||t; i++)
      |                                     ~~^~~~~~~~~~~~~~~

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