Why bottom left goes to n?

#1

lets say we have 4*4 matrix. we want sub matrix (0,0) to (3,3) then, we should iterate between these two points instead of after (3,3)

#2

@premang
Yes your loop will be
for(i=sx;i<=ex;i++)
for(j=sy;j<=ey;j++)
sum += mat[i][j]

#3

what is sx and ex ?

$ Sum Of All Submatrix From A given Matrix - Approach 1

#4

@premang
Lets say you need to calculate submatrix sum from (sx,sy) to (ex,ey)
In your ques that was (0,0) to (3,3)

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#5

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