why u take i+1 and j+1 for x why x=i* j it’s also right why u take x=(i+1)*(j+1) they are not part of the left corner ?
Sum of submatrix
@Anusree_Dey hey,we have taken i +1 and j+1 as these are no of rows and column in submatrix from 0,0 to i,j as indexing is 0 based so no of rows and columns in that submatrix will be i+1 and j+1 respectively ,hope you get it 
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Hey, can you send code for Sum of submatrix with approach one