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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
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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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 <word>. The command will add the keyword <word> into the search engine for search in the future. • Delete <word>. The command will remove the keyword <word> from the search engine, so that users will not get result when searching exact <word>. If the word doesn't exist, the command should not affect any other word the search engine. • Find <str>. Return the word if a word in the search engine is found and exactly matches with <str>, otherwise return an empty string "". • Search <str>. Return the first word with prefix matches <str>, 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, <word>s are strings that only contains lowercase letters, and <str>s are strings that contains lowercase letters and wildcard symbol *, which represent any letter in lowercase.
Transcribed Image Text: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 <word>. The command will add the keyword <word> into the search engine for search in the future. • Delete <word>. The command will remove the keyword <word> from the search engine, so that users will not get result when searching exact <word>. If the word doesn't exist, the command should not affect any other word the search engine. • Find <str>. Return the word if a word in the search engine is found and exactly matches with <str>, otherwise return an empty string "". • Search <str>. Return the first word with prefix matches <str>, 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, <word>s are strings that only contains lowercase letters, and <str>s are strings that contains lowercase letters and wildcard symbol *, which represent any letter in lowercase.
Constraints Input number n, w, q have constraints as following: 1 <= n <= 100, 1 <= w <= 500, 1 <= q <= 1000 Command related constraints: <command> is from list of [Add, Delete, Find, Search| Constrains for <word> and <str> are expressed using regex as following: ( [a-z]+) ( [a-z\*]+) <word> = <str> = In addition to the constraints on input, there's another constraint that your program should work with the following lab3.cpp: #include "SearchEngine.h" #include <iostream> using namespace std; int main(){ int n, w, q; cin>>n; while (n-- > 0){ cin >> w >> q; string word, cmd, arg; SearchEngine engine; while (w-- > 0){ cin >> word; engine.addWord(word); } while (q-- > 0){ cin >> cmd >> arg; engine.executeCommand (cmd, arg); } } return 0; }
Transcribed Image Text:Constraints Input number n, w, q have constraints as following: 1 <= n <= 100, 1 <= w <= 500, 1 <= q <= 1000 Command related constraints: <command> is from list of [Add, Delete, Find, Search| Constrains for <word> and <str> are expressed using regex as following: ( [a-z]+) ( [a-z\*]+) <word> = <str> = In addition to the constraints on input, there's another constraint that your program should work with the following lab3.cpp: #include "SearchEngine.h" #include <iostream> using namespace std; int main(){ int n, w, q; cin>>n; while (n-- > 0){ cin >> w >> q; string word, cmd, arg; SearchEngine engine; while (w-- > 0){ cin >> word; engine.addWord(word); } while (q-- > 0){ cin >> cmd >> arg; engine.executeCommand (cmd, arg); } } return 0; }
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