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Grokking the Coding Interview Patterns

Solution: Top K Frequent Words

Explore how to identify the top k most frequent words in a list using a combination of trie data structures and bucket sort. Learn to implement a frequency map, organize words by frequency in tries, and efficiently retrieve results sorted by frequency and lexicographical order. This lesson helps you develop an optimal solution with linear time complexity suitable for coding interviews.

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Statement

Given a list of strings words and an integer k, return the k most frequently occurring strings.

Note: The result should be sorted in descending order based on frequency. If multiple words have the same frequency, they should be sorted in lexicographical order.

Constraints:

  • 1≤1 \leq words.length ≤100\leq 100

  • 1≤1 \leq words[i].length ≤10\leq 10

  • 1≤1 \leqk ≤\leq number of unique words in the list

  • words[i] consists of lowercase English letters. ...

Solution