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g2001_2100.s2080_range_frequency_queries.readme.md Maven / Gradle / Ivy

2080\. Range Frequency Queries

Medium

Design a data structure to find the **frequency** of a given value in a given subarray.

The **frequency** of a value in a subarray is the number of occurrences of that value in the subarray.

Implement the `RangeFreqQuery` class:

*   `RangeFreqQuery(int[] arr)` Constructs an instance of the class with the given **0-indexed** integer array `arr`.
*   `int query(int left, int right, int value)` Returns the **frequency** of `value` in the subarray `arr[left...right]`.

A **subarray** is a contiguous sequence of elements within an array. `arr[left...right]` denotes the subarray that contains the elements of `nums` between indices `left` and `right` (**inclusive**).

**Example 1:**

**Input**

    ["RangeFreqQuery", "query", "query"]
    [[[12, 33, 4, 56, 22, 2, 34, 33, 22, 12, 34, 56]], [1, 2, 4], [0, 11, 33]]

**Output:** [null, 1, 2]

**Explanation:**

    RangeFreqQuery rangeFreqQuery = new RangeFreqQuery([12, 33, 4, 56, 22, 2, 34, 33, 22, 12, 34, 56]);
    rangeFreqQuery.query(1, 2, 4); // return 1. The value 4 occurs 1 time in the subarray [33, 4]
    rangeFreqQuery.query(0, 11, 33); // return 2. The value 33 occurs 2 times in the whole array. 

**Constraints:**

*   1 <= arr.length <= 105
*   1 <= arr[i], value <= 104
*   `0 <= left <= right < arr.length`
*   At most 105 calls will be made to `query`