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Solution: Vowel Spellchecker

Explore how to build a vowel spellchecker by leveraging hash maps to handle exact word matches, case differences, and vowel substitutions. Understand the step-by-step solution that preprocesses word lists into lookup structures to correct queries with spelling variations, and analyze the algorithm's time and space complexity for efficient implementation.

Statement

Given a list of correct words wordlist and a list of queries, implement a spellchecker that attempts to match each query word to a correct word from wordlist.

The spellchecker handles two categories of spelling mistakes:

Capitalization: If the query matches a word in wordlist when compared case insensitively, the query is corrected to the matching word as it appears in wordlist.

Vowel Errors: If, after replacing every vowel ('a', 'e', 'i', 'o', 'u') in the query with any vowel individually, the resulting word matches a word in wordlist (case insensitively), the query is corrected to that matching word. The words must be the same length and differ only in which vowels occupy the vowel positions.

The spellchecker uses the following precedence rules to determine the result for each query:

  • If the query exactly matches a word in wordlist (case sensitive), return that exact word.

  • Otherwise, if the query matches a word in wordlist up to capitalization differences, return the first such match in wordlist.

  • Otherwise, if the query matches a word in wordlist up to vowel errors (case insensitive), return the first such match in wordlist.

  • If no match is found, return the empty string "".

Return a list answer where answer[i] is the corrected word for queries[i].

Note: Vowels are the characters 'a', 'e', 'i', 'o', 'u' (both lowercase and uppercase are considered vowels for matching purposes).

Constraints:

  • 11 \leq ...