Range Sum Query 2D - Immutable Solution || Leetcode || PREPDOJO

Given a 2D matrix matrix, handle multiple queries of the following type:

Calculate the sum of the elements of matrix inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row2, col2).

Background Music:
---------------------------------
Song: Jarico - Island
Music supported by #BackgroundMusicWithoutLimitations​