Can anyone recommend some good data structure problems? I'm looking for problems that involve data structures like segment tree, DSU, treap, etc., but the tag on codeforces seems to cover everything from LIS to TSP. They should be around the same difficulty as the following problems: - APIO New Home - APIO Street Lamps - APIO Bridges

In other words, nothing too hard or too easy, but require some thinking to solve. Thanks in advanced!