Range Sum Query - Immutable

Explore how to implement the NumArray class in C# to efficiently handle range sum queries on an integer array. Understand the logic behind calculating sums between indices and practice designing custom data structures that optimize query operations for coding interviews.

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Statement

You are given an integer array, nums, and you need to handle multiple queries of the following type:

Query: Calculate the sum of elements in nums between indices i and j (inclusive), where i <= j.

Implement the NumArray class to support the following operations efficiently:

Constructor: Initializes the object with the integer array nums.
sumRange(i, j): Returns the sum of the elements of nums between indices i and j (inclusive), i.e., the sum of nums[i] + nums[i + 1] + ... + nums[j].

Constraints:

$1 \leq$ ...