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.