/in/foo.cc: In member function 'void Array::insert(int)':
/in/foo.cc:19:21: warning: unused variable 'i' [-Wunused-variable]
   19 |                 int i = 0;
      |                     ^
/in/foo.cc: In member function 'void Array::Output()':
/in/foo.cc:35:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |                 for (int i = 0; i < a.size(); i++)
      |                                 ~~^~~~~~~~~~