/in/foo.cc: In function 'int main()':
/in/foo.cc:8:41: warning: iteration 202 invokes undefined behavior [-Waggressive-loop-optimizations]
  for(int i = 1; i < maxdigits; i++)a[i] = 0;
                                    ~~~~~^~~
/in/foo.cc:8:19: note: within this loop
  for(int i = 1; i < maxdigits; i++)a[i] = 0;
                 ~~^~~~~~~~~~~
/in/foo.cc:9:13: warning: array subscript is above array bounds [-Warray-bounds]
  a[maxdigits] = 1;
  ~~~~~~~~~~~^
/in/foo.cc:24:18: warning: array subscript is above array bounds [-Warray-bounds]
  a[maxdigits] -= 2;
                  ^
/in/foo.cc:24:15: warning: array subscript is above array bounds [-Warray-bounds]
  a[maxdigits] -= 2;
  ~~~~~~~~~~~~~^~~~