DIY: Range Sum Query 2D — Immutable
Explore how to build a NumMatrix class in Kotlin that efficiently calculates the sum of sub-regions in a 2D matrix. Understand the matrix constraints, how to handle multiple sum queries, and implement the sumRegion method to solve range sum problems in coding interviews.
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, ...