LeetCode – Top K Frequent Elements (Java)

Given an array of integers, write a method to return the k most frequent elements. Java Solution 1 – Heap Time complexity is O(n*log(k)). Note that heap is often used to reduce time complexity from n*log(n) (see solution 3) to n*log(k). public List<Integer> topKFrequent(int[] nums, int k) { //count the frequency for each element HashMap<Integer, … Read more