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Learn Data Structures and Algorithms in C++

Problem: Top K Frequent Elements

Explore how to solve the problem of finding the top K frequent elements in an integer array using a min heap data structure. Learn to implement a frequency map and maintain a heap of size K for efficient retrieval, achieving better time complexity than traditional sorting methods.

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Statement

You are given an integer array nums and an integer k. Your task is to find the k elements that appear most frequently in nums. The result may be returned in any order.

Note: As a follow up, try to design an algorithm with time complexity better than O(nlog⁡n)O(n \log n), where nn is the size of the array.

Constraints:

  • 1≤1 \leq nums.length ≤105\leq 10^5

  • −104≤-10^4 \leq nums[i] ...