Kindly explain the final solution of sum of all submatrices

#1

hi, I could not understand the concept of contribution of elements, etc could you please explain the whole concept of the final solution

#2

hi @gurkirat2600
go through the lecture again and try to dry run on paper, u will get better insight…
u can refer this code --> https://ide.codingblocks.com/s/235562

#3

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