Константные методы

RobertDeMilo

Oct 21st, 2023

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#include <algorithm>
#include <iostream>
#include <set>
#include <string>
#include <utility>
#include <vector>
using namespace std;
const int MAX_RESULT_DOCUMENT_COUNT = 5;
string ReadLine() {
string s;
getline(cin, s);
return s;
}
int ReadLineWithNumber() {
int result = 0;
cin >> result;
ReadLine();
return result;
}
vector<string> SplitIntoWords(const string& text) {
vector<string> words;
string word;
for (const char c : text) {
if (c == ' ') {
if (!word.empty()) {
words.push_back(word);
word.clear();
}
} else {
word += c;
}
}
if (!word.empty()) {
words.push_back(word);
}
return words;
}
struct Document {
int id;
int relevance;
};
bool HasDocumentGreaterRelevance(const Document& lhs, const Document& rhs) {
return lhs.relevance > rhs.relevance;
}
class SearchServer {
public:
void SetStopWords(const string& text) {
for (const string& word : SplitIntoWords(text)) {
stop_words_.insert(word);
}
}
void AddDocument(int document_id, const string& document) {
const vector<string> words = SplitIntoWordsNoStop(document);
documents_.push_back({document_id, words});
}
vector<Document> FindTopDocuments(const string& raw_query) const {
const set<string> query_words = ParseQuery(raw_query);
auto matched_documents = FindAllDocuments(query_words);
sort(matched_documents.begin(), matched_documents.end(), HasDocumentGreaterRelevance);
if (matched_documents.size() > MAX_RESULT_DOCUMENT_COUNT) {
matched_documents.resize(MAX_RESULT_DOCUMENT_COUNT);
}
return matched_documents;
}
private:
struct DocumentContent {
int id = 0;
vector<string> words;
};
vector<DocumentContent> documents_;
set<string> stop_words_;
bool IsStopWord(const string& word) const {
return stop_words_.count(word) > 0;
}
vector<string> SplitIntoWordsNoStop(const string& text) const {
vector<string> words;
for (const string& word : SplitIntoWords(text)) {
if (!IsStopWord(word)) {
words.push_back(word);
}
}
return words;
}
set<string> ParseQuery(const string& text) const {
set<string> query_words;
for (const string& word : SplitIntoWordsNoStop(text)) {
query_words.insert(word);
}
return query_words;
}
vector<Document> FindAllDocuments(const set<string>& query_words) const {
vector<Document> matched_documents;
for (const auto& document : documents_) {
const int relevance = MatchDocument(document, query_words);
if (relevance > 0) {
matched_documents.push_back({document.id, relevance});
}
}
return matched_documents;
}
static int MatchDocument(const DocumentContent& content, const set<string>& query_words) {
if (query_words.empty()) {
return 0;
}
set<string> matched_words;
for (const string& word : content.words) {
if (matched_words.count(word) != 0) {
continue;
}
if (query_words.count(word) != 0) {
matched_words.insert(word);
}
}
return static_cast<int>(matched_words.size());
}
};
SearchServer CreateSearchServer() {
SearchServer search_server;
search_server.SetStopWords(ReadLine());
const int document_count = ReadLineWithNumber();
for (int document_id = 0; document_id < document_count; ++document_id) {
search_server.AddDocument(document_id, ReadLine());
}
return search_server;
}
int main() {
const SearchServer search_server = CreateSearchServer();
const string query = ReadLine();
for (const auto& [document_id, relevance] : search_server.FindTopDocuments(query)) {
cout << "{ document_id = "s << document_id << ", "
<< "relevance = "s << relevance << " }"s << endl;
}
}

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