Submatrix sum query

#1


here why not the sum of sub matrix denoted by top left(li,lj) and bottom right(bi,bj)is coming using prefix matrix
plz help me out of this problem

#2

@mohitsharmakosi2001 that way i think is not correct:

#3

ok got it now thank you

#4

I hope I’ve cleared your doubt. I ask you to please rate your experience here
Your feedback is very important. It helps us improve our platform and hence provide you
the learning experience you deserve.

On the off chance, you still have some questions or not find the answers satisfactory, you may reopen
the doubt.