In 1-D we can find sum in range [l,r] using sum[r] - sum[l - 1]. In 2-D we can find sum in range (x1,y1) to (x2,y2) using sum[x2][y2]-sum[x2][y1]-sum[x1][y2]+sum[x1][y1] where sum[] or sum[][] is cumulative sum .

How to find sum in range from (x1,y1,z1) to (x2,y2,z2) in a similar way ?