{leetcode}/problems/range-sum-query-immutable/[LeetCode - Range Sum Query - Immutable^]
Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive.
Example:
Given nums = [-2, 0, 3, -5, 2, -1] sumRange(0, 2) -> 1 sumRange(2, 5) -> -1 sumRange(0, 5) -> -3
Note:
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You may assume that the array does not change.
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There are many calls to sumRange function.