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2719. Count of Integers 👍

Problem

You are given two numeric strings num1 and num2 and two integers max_sum and min_sum. We denote an integer x to be good if:

  • num1 <= x <= num2
  • min_sum <= digit_sum(x) <= max_sum.

Return the number of good integers. Since the answer may be large, return it modulo 109 + 7.

Note that digit_sum(x) denotes the sum of the digits of x.

 

Example 1:

Input: num1 = "1", num2 = "12", min_sum = 1, max_sum = 8
Output: 11
Explanation: There are 11 integers whose sum of digits lies between 1 and 8 are 1,2,3,4,5,6,7,8,10,11, and 12. Thus, we return 11.

Example 2:

Input: num1 = "1", num2 = "5", min_sum = 1, max_sum = 5
Output: 5
Explanation: The 5 integers whose sum of digits lies between 1 and 5 are 1,2,3,4, and 5. Thus, we return 5.

 

Constraints:

  • 1 <= num1 <= num2 <= 1022
  • 1 <= min_sum <= max_sum <= 400