Maybe this would be helpful :)

https://codeforces.me/blog/entry/134747

https://codeforces.me/contest/2001/problem/E1

A simple DP, I nearly solved it during the contest.

https://codeforces.me/problemset/problem/1916/D

https://codeforces.me/contest/1770/problem/C

1921E - Eat the Chip

https://codeforces.me/contest/1841/problem/C not favorite though but it's a good problem ig.

https://codeforces.me/contest/1559/problem/D2 , This one is a really nice problem and there is a really nice approach using two pointers in the comments

I would like to recommend some problems:

1097F - Alex and a TV Show

627D - Preorder Test

1657F - Words on Tree

1292D - Chaotic V. — This one is actually 2700 but I recommend it because of the quite easy approach using virtual tree.

i leave this in almost every similar post,

1714F - Build a Tree and That Is It,

also here are some good graph/trees problems:

https://codeforces.me/problemset/problem/718/C a nice segment tree problem

This problem managed to make me enjoy segment tree shenanigans

446C - DZY Loves Fibonacci Numbers

1503C - Travelling Salesman Problem

1977C — Nikita and LCM

I think it is a nice problem.

1776J — Italian data centers

It would be good if you do something like a public google sheet where you put the problems the you are collecting from the comments section. btw, here is a problem that uses a well-known idea, so I think it's good to keep it in mind.

https://codeforces.me/contest/1996/problem/F