Digit Sum - MarisaOJ: Marisa Online Judge

Let's denote the function

$f(x)$ which takes non-negative integers

$x$ as input as the sum of digits of

$x$ . Calculate:

$\sum_{i = L}^{R}f(i)$ ### Input - A single line contains 2 integers

$L,R$ . ### Output - Print the result. ### Constraints -

$0 \le L\le R \le 10^{12}$ . ### Example Input:

$9 11$

Output:

$12$

Topic

Dynamic Programming

Rating

1400

Solution (0)

Solution