Q:You are given an array of n elements. Now, there are 2 types of queries on the array. 1) Change the element at index i to some new element(say x). 2)Given l and r ,find the number of subarrays in range l to r having sum divisible by 3. The number of queries can be upto 1e5 and also size of the array can be upto 1e5.

This is not from some ongoing coding contest. I found this question on gfg from a company's interview experience. Link to that blog:- https://www.geeksforgeeks.org/nutanix-interview-experience-for-mts-intern-off-campus-2021/