Leetcode Problem 2080. Range Frequency Queries

2080. Range Frequency Queries

Leetcode Solutions

Hashing with Binary Search

  1. Initialize a hashmap to store the indices of each value in the array.
  2. Iterate through the array, and for each element, append its index to the corresponding list in the hashmap.
  3. For each query, retrieve the list of indices for the given value.
  4. Perform a binary search to find the count of indices within the specified range.
  5. Return the count as the frequency of the value in the subarray.
UML Thumbnail

Segment Tree with Frequency Maps

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