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Auto comment: topic has been updated by is-this-ufds (previous revision, new revision, compare).
It really depends on what level you're coding at now.
I would suggest using the dp tags as a guide, but beware that many problems are tagged dp when dp is either not necessary or not relevant.
Here are a few I have tried myself recently: https://codeforces.me/problemset/problem/455/A https://codeforces.me/problemset/problem/1418/C https://codeforces.me/problemset/problem/1398/D https://codeforces.me/problemset/problem/1385/D (I solved using recursion, which is the same idea as DP) https://codeforces.me/problemset/problem/1253/C https://codeforces.me/problemset/problem/706/C https://codeforces.me/problemset/problem/545/C
These are all in the range 1500-1800. Obviously harder problems exist, but given my rating this is about where I'm operating so I can't recommend much beyond this range.
thanks a lot!!
https://atcoder.jp/contests/dp
https://atcoder.jp/contests/dp