Solution


Approach 1: HashMap

Intuition and Algorithm

We analyze the 3 cases that the algorithm needs to consider: when the query is an exact match, when the query is a match up to capitalization, and when the query is a match up to vowel errors.

In all 3 cases, we can use a hash table to query the answer.

  • For the first case (exact match), we hold a set of words to efficiently test whether our query is in the set.
  • For the second case (capitalization), we hold a hash table that converts the word from its lowercase version to the original word (with correct capitalization).
  • For the third case (vowel replacement), we hold a hash table that converts the word from its lowercase version with the vowels masked out, to the original word.

The rest of the algorithm is careful planning and reading the problem carefully.

Complexity Analysis

  • Time Complexity: , where is the total content of wordlist and queries.

  • Space Complexity: .


Analysis written by: @awice.