foo.cc: In constructor 'BigIntArray::BigIntArray(std::string)':
foo.cc:13:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |         for(int i=0;i<s.length();i++)
      |                     ~^~~~~~~~~~~
foo.cc: In member function 'bool BigIntArray::operator<(BigIntArray&)':
foo.cc:22:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |             for(int i=0;i<a.size();i++)
      |                         ~^~~~~~~~~
foo.cc: In member function 'void BigIntArray::Output()':
foo.cc:34:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |         for(int i=0;i<a.size();i++)
      |                     ~^~~~~~~~~

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