Given an integer array nums, return the total number of centered subarrays.

A subarray is considered centered if the sum of all its elements is equal to at least one element contained within that subarray.

A subarray is a contiguous non empty sequence of elements within an array.

Constraints:

• $1 \leq$ nums.length $\leq 500$

• $-10^5 \leq$ nums[i] $\leq 10^5$

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