Cumulative Rainfall Problem¶
Your job is to monitor the rainfall 
in a region that you’ve broken into a 3x4 grid. Every time a storm comes, if a cell
in the grid gets rain, you record it. At the end of a month you have the following two arrays of data.
import numpy as np
rain_locations = np.array([
[2,3],
[0,1],
[2,2],
[2,3],
[1,1],
[2,3],
[1,1]
])
rain_amounts = np.array([0.5,1.1,0.2,0.9,1.3,0.4,2.0])
Build a 3x4 array representing the total accumulated rainfall in each cell of the grid.