Meaning of contribution made by element

pls explain what is meant by contribution of an element in the sum
like what is the significance of the
’ contribution made by an element’.
thanks

@vatsal50 hey contribute just tell us whether current element has been included in that submatri summ or not ,suppose we are taking submatrix and if it contains current element so it contributes to the sum of that submatrix,hope you get it :slight_smile: