Add solution #966

Author: JoshCrozier

README.md

@@ -23,6 +23,7 @@
 890|[Find and Replace Pattern](./0890-find-and-replace-pattern.js)|Medium|
 916|[Word Subsets](./0916-word-subsets.js)|Medium|
 929|[Unique Email Addresses](./0929-unique-email-addresses.js)|Easy|
+966|[Vowel Spellchecker](./0966-vowel-spellchecker.js)|Medium|
 970|[Powerful Integers](./0970-powerful-integers.js)|Easy|
 976|[Largest Perimeter Triangle](./0976-largest-perimeter-triangle.js)|Easy|
 977|[Squares of a Sorted Array](./0977-squares-of-a-sorted-array.js)|Easy|

solutions/0966-vowel-spellchecker.js

@@ -0,0 +1,44 @@
+/**
+ * 966. Vowel Spellchecker
+ * https://leetcode.com/problems/vowel-spellchecker/
+ * Difficulty: Medium
+ *
+ * Given a wordlist, we want to implement a spellchecker that converts a query word into a correct word.
+ * For a given query word, the spell checker handles two categories of spelling mistakes:
+ *
+ * - Capitalization: If the query matches a word in the wordlist (case-insensitive), then the query word
+ *   is returned with the same case as the case in the wordlist.
+ *   Example: wordlist = ["yellow"], query = "YellOw": correct = "yellow"
+ *   Example: wordlist = ["Yellow"], query = "yellow": correct = "Yellow"
+ *   Example: wordlist = ["yellow"], query = "yellow": correct = "yellow"
+ * - Vowel Errors: If after replacing the vowels ('a', 'e', 'i', 'o', 'u') of the query word with any vowel
+ *   individually, it matches a word in the wordlist (case-insensitive), then the query word is returned
+ *   with the same case as the match in the wordlist.
+ *   Example: wordlist = ["YellOw"], query = "yollow": correct = "YellOw"
+ *   Example: wordlist = ["YellOw"], query = "yeellow": correct = "" (no match)
+ *   Example: wordlist = ["YellOw"], query = "yllw": correct = "" (no match)
+ *
+ * In addition, the spell checker operates under the following precedence rules:
+ * - When the query exactly matches a word in the wordlist (case-sensitive), you should return the same word back.
+ * - When the query matches a word up to capitlization, you should return the first such match in the wordlist.
+ * - When the query matches a word up to vowel errors, you should return the first such match in the wordlist.
+ * - If the query has no matches in the wordlist, you should return the empty string.
+ *
+ * Given some queries, return a list of words answer, where answer[i] is the correct word for query = queries[i].
+ */
+
+/**
+ * @param {string[]} words
+ * @param {string[]} queries
+ * @return {string[]}
+ */
+var spellchecker = function(words, queries) {
+  const set = new Set(words);
+  const map = new Map();
+  const format = s => s.toLowerCase().replace(/[aeiou]/g, '_');
+  words.forEach(word => {
+    if (!map.has(word.toLowerCase())) map.set(word.toLowerCase(), word);
+    if (!map.has(format(word))) map.set(format(word), word);
+  });
+  return queries.map(q => set.has(q) ? q : map.get(q.toLowerCase()) || map.get(format(q)) || '');
+};