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g0301_0400.s0327_count_of_range_sum.readme.md Maven / Gradle / Ivy

327\. Count of Range Sum

Hard

Given an integer array `nums` and two integers `lower` and `upper`, return _the number of range sums that lie in_ `[lower, upper]` _inclusive_.

Range sum `S(i, j)` is defined as the sum of the elements in `nums` between indices `i` and `j` inclusive, where `i <= j`.

**Example 1:**

**Input:** nums = [-2,5,-1], lower = -2, upper = 2

**Output:** 3

**Explanation:** The three ranges are: [0,0], [2,2], and [0,2] and their respective sums are: -2, -1, 2. 

**Example 2:**

**Input:** nums = [0], lower = 0, upper = 0

**Output:** 1 

**Constraints:**

*   1 <= nums.length <= 105
*   -231 <= nums[i] <= 231 - 1
*   -105 <= lower <= upper <= 105
*   The answer is **guaranteed** to fit in a **32-bit** integer.