message: Update count-special-integers.cpp
diff: @@ -19,7 +19,7 @@ public:
  result += P(9, 1) * P(9, i - 1);
  }
  unordered_set<int> lookup;
  - for (int i = 0; i < digits.length(); ++i) {
  + for (int i = 0; i < size(digits); ++i) {
  for (int d = int(i == 0); d < digits[i] - '0'; ++d) {
  if (lookup.count(d)) {
  continue;
  