foo.cc: In member function 'void BigIntArray::Sort()':
foo.cc:145:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<BigInt>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  145 |   for(int i=1; i<Arr.size(); i++)
      |                ~^~~~~~~~~~~
foo.cc: In function 'std::ostream& operator<<(std::ostream&, const BigIntArray&)':
foo.cc:156:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<BigInt>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  156 |   for(int i=0; i<BI.Arr.size(); i++)
      |                ~^~~~~~~~~~~~~~
foo.cc: In function 'std::istream& operator>>(std::istream&, BigIntArray&)':
foo.cc:162:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<BigInt>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  162 |   for(int i=0; i<BI.Arr.size(); i++)
      |                ~^~~~~~~~~~~~~~

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