My understanding of this problem is equivalent to find values within some specific volume, and for that we need to reduce the start from (0,0,0) to (startX,startY,startZ). And for that we need to take care of the overlapping volume. Let me know whether the approach is the right one or not as I am finding all wrong answer in all of the test cases at https://ide.codingblocks.com/s/158841.
3D Structure in Fenwick Section
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