Total Digit Sum in a Range
Print the sum of digit-sums of all integers in [L, R].
Input: one line with two integers L and R.
Output: ∑x=L..R digitsum(x).
Constraints:
- 1 ≤ L ≤ R ≤ 1018
Sample Tests
Input 1
1 12
Output 1
51
Input 2
5 5
Output 2
5
Discussion (opens after you solve — no spoilers before)
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