foo.cc: In instantiation of 'std::vector<long long int> operator*(std::vector<long long int>&, const Matrix<long long int>&)':
foo.cc:290:11:   required from here
foo.cc:173:15: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'const int' [-Wsign-compare]
  173 |    if(x.size()!=y.size_r)
foo.cc:181:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  181 |     for(int j=0;j<x.size();++j)
   
  
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