message: Update numbers-with-repeated-digits.cpp
diff: @@ -39,9 +39,8 @@ public:
  private:
  int P(int m, int n) const {
  int result = 1;
  - while (n > 0) {
  - result *= m - n + 1;
  - --n;
  + while (n--) {
  + result *= m--;
  }
  return result;
  }
  