Hello, Codeforces!!
These are some standard digit DP problems with their solution from which a beginner can start.
1)GONE(Spoj) Problem link : Gone. Solution link : Gone
2) Digit Sum(Spoj) Problem link : Digit Sum. Solution link : Digit Sum
3) Investigation(LightOJ) Problem link : Investigation. Solution link : Investigation
4)Palindromic Numbers(LightOJ) Problem link : Palindromic Numbers. Solution link : Palindromic Numbers
5) Counting Numbers(CSES) Problem link : Counting Numbers. Solution link : Counting Numbers