Given an integer d between 0 and 9, and two positive integers low and high as lower and upper bounds, respectively. Return the number of times that d occurs as a digit in all integers between low and high, including the bounds low and high. Example 1: Input: d = 1, low = 1, high = 13 Output: 6 Explanation: The digit d=1 occurs 6 times in 1,10,11,12,13. Note that the digit d=1 occurs twice in the number 11. Example 2: Input: d = 3, low = 100, high = 250 Output: 35 Explanation: The digit d=3 occurs 35 times in 103,113,123,130,131,...,238,239,243. Note: 0 <= d <= 9 1 <= low <= high <= 2×10^8