foo.cc: In function 'void output(std::vector<bigint>&)':
foo.cc:103:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bigint>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  103 |  for (int i = 0; i < A.size(); i++) {
      |                  ~~^~~~~~~~~~
foo.cc: In member function 'bool bigint::operator>(bigint&)':
foo.cc:69:3: warning: control reaches end of non-void function [-Wreturn-type]
   69 |   }
      |   ^

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