Solution: Design Add and Search Words Data Structure
Explore how to design and implement a WordDictionary data structure using a trie. Understand adding words, searching with exact and wildcard queries, and retrieving all stored words efficiently. Learn the time and space complexity considerations to apply this pattern for optimized string searching in coding interviews.
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Statement
Design a data structure called WordDictionary that supports the following functionalities:
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Constructor: This function will initialize the object.
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Add Word(word): This function will store the provided word in the data structure.
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Search Word(word): This function will return TRUE if any string in the WordDictionary object matches the query word. Otherwise, it will return FALSE. If the query word contains dots,
., each dot is free to match any letter of the alphabet.For example, the dot in the string “.ad” can have possible search results like “aad”, “bad”, “cad”, and so on.
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Get Words(): This function will return all the words in the WordDictionary class.
Constraints:
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word.length -
Words passed to Add Word() consist of lowercase English letters.
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Words passed to Search Word() consist of
.or lowercase English letters. -
There will be, at most, three dots in a word passed to Search Word().
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At most, ...