Description A local company is seeking for help on their search service. They want to implement a search engine and provide functionality to show related words stored in their database. The search engine should support following command: • Add . The command will add the keyword into the search engine for search in the future. • Delete . The command will remove the keyword from the search engine, so that users will not get result when searching exact . If the word doesn't exist, the command should not affect any other word in the search engine. • Find . Return the word if a word in the search engine is found and exactly matches with , otherwise return an empty string "". • Search . Return the first word with prefix matches , if there are multiple matches, just return the first word matches alphabetically. For example, suppose that we have applejack and application in the search engine. If we run command Search app, the search engine returns applejack since applejack is alphabetically smaller than application. To simplify the implementation, s are strings that only contains lowercase letters, and s are strings that contains lowercase letters and wildcard symbol *, which represent any letter in lowercase.

Description A local company is seeking for help on their search service. They want to implement a search engine and provide functionality to show related words stored in their database. The search engine should support following command: • Add . The command will add the keyword into the search engine for search in the future. • Delete . The command will remove the keyword from the search engine, so that users will not get result when searching exact . If the word doesn't exist, the command should not affect any other word in the search engine. • Find . Return the word if a word in the search engine is found and exactly matches with , otherwise return an empty string "". • Search . Return the first word with prefix matches , if there are multiple matches, just return the first word matches alphabetically. For example, suppose that we have applejack and application in the search engine. If we run command Search app, the search engine returns applejack since applejack is alphabetically smaller than application. To simplify the implementation, s are strings that only contains lowercase letters, and s are strings that contains lowercase letters and wildcard symbol *, which represent any letter in lowercase.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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