I have made a video on digit DP.

These are the timestamps of what I have covered in the video of digit DP.

• 0:03 — Type of problems
• 0:15 — Example
• 0:40 — Bruteforce solution
• 1:14 — Count the number representation with exactly K digits having
• the sum of digits equals S.
• 6:33 — Count numbers whose sum of digits equals S in the range A to B
• 12:17 — Code

Video Link.