1067. Digit Count in Range

1067. Digit Count in Range

难度: Hard

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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.

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