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g0301_0400.s0303_range_sum_query_immutable.readme.md Maven / Gradle / Ivy

303\. Range Sum Query - Immutable

Easy

Given an integer array `nums`, handle multiple queries of the following type:

1.  Calculate the **sum** of the elements of `nums` between indices `left` and `right` **inclusive** where `left <= right`.

Implement the `NumArray` class:

*   `NumArray(int[] nums)` Initializes the object with the integer array `nums`.
*   `int sumRange(int left, int right)` Returns the **sum** of the elements of `nums` between indices `left` and `right` **inclusive** (i.e. `nums[left] + nums[left + 1] + ... + nums[right]`).

**Example 1:**

**Input**

    ["NumArray", "sumRange", "sumRange", "sumRange"]
    [[[-2, 0, 3, -5, 2, -1]], [0, 2], [2, 5], [0, 5]]

**Output:** [null, 1, -1, -3]

**Explanation:**

    NumArray numArray = new NumArray([-2, 0, 3, -5, 2, -1]);
    numArray.sumRange(0, 2); // return (-2) + 0 + 3 = 1
    numArray.sumRange(2, 5); // return 3 + (-5) + 2 + (-1) = -1
    numArray.sumRange(0, 5); // return (-2) + 0 + 3 + (-5) + 2 + (-1) = -3 

**Constraints:**

*   1 <= nums.length <= 104
*   -105 <= nums[i] <= 105
*   `0 <= left <= right < nums.length`
*   At most 104 calls will be made to `sumRange`.