Column wise addition

#1

why you write
a [ i ] [ j ]+= a [ i ] [ j ]+a [ i ] [ j +1] but i think you must write
a [ i ] [ j ]+= a [ i ] [ j ]+a [ i ] [ j -1]
please tell me why you write j+1 in column wise addition

#2

both are correct it depend on how you run the loop
In the video “j” started from “m-2” and decrease every time hence it is also correct
image

#3

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