Let me do a quick recap. The previous post described three use cases for segment trees (persistent/static, point updates and range updates) and explained the first two, leaving the last as the subject matter for this post. This post will describe how we can use range updates with segment trees, lazy propagation and various optimizations possible.
This post is in continuation to a previous post on segment trees. If you haven’t read that post already, it would be a good idea to read that first.