foo.cc: In member function ‘void BigNumber::Div(const BigNumber&)’:
foo.cc:153:51: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<unsigned int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
  153 |                                 for (int i = 1; i < rlist.size(); i++) {
      |                                                 ~~^~~~~~~~~~~~~~

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