For this problem, the tutorial states that maintaining the sum of a Geometric Progression is a simple problem that can be solved using Segment Tree. However, I don't know how to do this (I think Lazy Propogation should be involved). Any help please?
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The editorial is not written very well and the proposed solution is kind of crazy. Xellos' comment does a much better job of explaining it.
Edit: Here's my code. Not very fast, but it fits. No matrix multiplication used either.