Watch 10 video solutions for Digit Count in Range, a hard level problem involving Math, Dynamic Programming. This walkthrough by Code with Alisha has 12,103 views views. Want to try solving it yourself? Practice on FleetCode or read the detailed text solution.
Given a single-digit integer d and two integers low and high, return the number of times that d occurs as a digit in all integers in the inclusive range [low, 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.
Constraints:
0 <= d <= 91 <= low <= high <= 2 * 108