DIY: Range Sum Query 2D — Immutable
Explore how to implement the NumMatrix class to efficiently compute sum queries on subregions of a 2D matrix. This lesson helps you understand handling multiple range sum queries for immutable matrices, preparing you for similar coding interview problems.
We'll cover the following...
We'll cover the following...
Problem statement
Given an m * n matrix, you need to handle multiple queries of the following type:
Calculate the sum of the elements of the matrix inside the rectangle defined by its upper left corner, ...