$ Sum Of All Submatrix From A given Matrix - Approach 2

#1

some cases index goes to -1 so how can i handle this condtion
for example top pointer 0,0 and botton pointer 1,1 then we also calculate pre[-1][-1], pre[1][-1]
and pre[-1][1] such invalide index

#2

Hello @khemchandrs,

Solution:
Add some conditional checks to your code to avoid such cases:

The junk values are getting added and subtracted from the sum for the cases:

  • When li=0
  • when lj=0

You have to check for these cases before computing the sum.

Refer to the following code to better understand what i am saying:

Hope, this would help.
Give a like if you are satisfied.

#3

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