Top K Frequent Elements
Detailed guide and Python implementation for the 'Top K Frequent Elements' problem.
Problem Statement
Given an integer array nums and an integer k, return the k most frequent elements. You may return the answer in any order.
Write a function topKFrequent(nums: List[int], k: int) -> List[int].
- •1 <= len(nums) <= 10^5
- •-10^4 <= nums[i] <= 10^4
- •k is in the range [1, number of unique elements in nums]
- •The answer is guaranteed to be unique
Examples
nums = [1, 1, 1, 2, 2, 3], k = 2
[1, 2]
1 appears 3 times and 2 appears 2 times. These are the 2 most frequent elements.
nums = [1], k = 1
[1]
There is only one element, so it is the most frequent.
Need a Hint?
Edge Cases to Watch
- Empty input structures
- Single element inputs
- Large numerical bounds
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