Divisible by Digit Count

Difficulty: 1300 4000 ms 128 MB

math digit-dp

Count integers in [L, R] that are divisible by their own number of decimal digits.

Input: one line with two integers L and R.

Output: the count in [L, R].

Constraints:

• 1 ≤ L ≤ R ≤ 10¹⁸

Sample Tests

1 20

15

10 30

11

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