#2080

Range Frequency Queries

specialist · 980 · lc medium +32 · 42.3% accepted · 745 likes · top 23%

Description

Build a RangeFreqQuery data structure over a 0-indexed integer array arr. Support a query(left, right, value) method that returns how many times value appears in the contiguous subarray arr[left..right] (inclusive). Constructor: RangeFreqQuery(arr). Query: query(left, right, value) -> int.

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]

Example 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.

Code

class RangeFreqQuery:

    def __init__(self, arr: List[int]):
        

    def query(self, left: int, right: int, value: int) -> int:
        


# Your RangeFreqQuery object will be instantiated and called as such:
# obj = RangeFreqQuery(arr)
# param_1 = obj.query(left,right,value)

class RangeFreqQuery:

    def __init__(self, arr: List[int]):
        

    def query(self, left: int, right: int, value: int) -> int:
        


# Your RangeFreqQuery object will be instantiated and called as such:
# obj = RangeFreqQuery(arr)
# param_1 = obj.query(left,right,value)