Solution: Top K Frequent Elements
Explore how to find the k most frequent elements in an integer array by counting frequencies with a hash map and efficiently maintaining a min-heap of the top k elements. Understand both a naive and an optimized heap-based solution, analyze their time and space complexities, and implement a clean solution using C++.
Statement
Given an array of integers, arr, and an integer, k, return the most frequent elements.
Note: You can return the answer in any order.
Constraints:
-
arr.length -
arr[i]