Sum of all the submatrices

#1

whiledoig the sum, why are you taking from(0,0) to (i-1,y) and (x,j-1)…
reason for taking j-1 and i-1 at that index???

#2

@Ambuj-Singh-514796906079795
Can you please mention the point in the video where this hapeened

#3

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