This post is only for newbies. A very common trick with Cumulative Sum + BIT is discussed with some examples and problems. Here is the link Thanks for reading.
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Can u give some related problems...?
You don't actually need ones. Just remember the idea how to count the number of elements in a multiset that lie between
landr. When you'll encounter this subproblem, use the algorithm that was explained here.I mean that IMHO it's not a good idea to look for a problem, for which you know in advance using what algorithm you'll solve it (exception: the case when you need to practise quick coding of a standard algorithm).
https://codeforces.com/contest/474/problem/D
I think this one is similar https://atcoder.jp/contests/abc107/tasks/arc101_b
Well written.