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Isn't top down approach better than bottom up approach?

We are assuming that the the interval in array would be of 1 unit.

Suppose lowest unit is 0.1 and so on.
So the sum could be 10x moore distritbuted

between 1 and 2 there could 1.1, 1.2, 1.3…1.9

This would bring space complexity 10x than top down approach.
Any thoughts?

Cheers