We have landed on to our 3rd Important Coding Interview Pattern which is 2D Range Query and 2D Prefix Sum.
Problem Link: leetcode.com/problems/range-s...
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00:00-03:08 Problem and Brute Force
03:09-05:00 1D Prefix Sum Idea
05:01-10:37 2D Prefix Sum Idea
10:38-14:37 Answering Queries in O(1)
14:38-20:03 Code