/in/foo.cc: In function 'int main()':
/in/foo.cc:8:13: warning: array subscript is above array bounds [-Warray-bounds]
  a[maxdigits] = 1;
  ~~~~~~~~~~~^
/in/foo.cc:27:21: warning: array subscript is above array bounds [-Warray-bounds]
  cout << a[maxdigits] - 2;
          ~~~~~~~~~~~^