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[10/19] 692. Top K Frequent Words

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Given an array of strings words and an integer k, return the k most frequent strings.

Return the answer sorted by the frequency from highest to lowest. Sort the words with the same frequency by their lexicographical order.

 

Example 1:

Input: words = ["i","love","leetcode","i","love","coding"], k = 2
Output: ["i","love"]
Explanation: "i" and "love" are the two most frequent words.
Note that "i" comes before "love" due to a lower alphabetical order.

Example 2:

Input: words = ["the","day","is","sunny","the","the","the","sunny","is","is"], k = 4
Output: ["the","is","sunny","day"]
Explanation: "the", "is", "sunny" and "day" are the four most frequent words, with the number of occurrence being 4, 3, 2 and 1 respectively.

 

Constraints:

  • 1 <= words.length <= 500
  • 1 <= words[i].length <= 10
  • words[i] consists of lowercase English letters.
  • k is in the range [1, The number of unique words[i]]

 

Follow-up: Could you solve it in O(n log(k)) time and O(n) extra space?

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import heapq
import collections
class Solution:
    def topKFrequent(self, words: List[str], k: int) -> List[str]:
        counter = collections.Counter(words)
        
        max_heap = []
        
        for key, val in counter.items():
            max_heap.append((-val, key))
        
        heapq.heapify(max_heap)
        
        res = []
        
        while k and max_heap:
            freq, word = heapq.heappop(max_heap)
            res.append(word)
            k -= 1
        return res
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