/in/foo.cc:14:2: error: expected initializer before 'int'
  int i;
  ^~~
/in/foo.cc:16:2: error: 'a' does not name a type
  a[0] = base;
  ^
/in/foo.cc:17:2: error: expected unqualified-id before 'if'
  if (exponent == 1) return base;
  ^~
/in/foo.cc:18:2: error: expected unqualified-id before 'if'
  if (exponent & 1) ans = base;
  ^~
/in/foo.cc:19:2: error: expected unqualified-id before 'if'
  if (!a_calculated[base]) {
  ^~