View difference between Paste ID: FEqGQRWY and fwswr2H8

 #include <algorithm>
 #include <cmath>
 #include <iostream>
 #include <map>
 #include <set>
 #include <stdexcept>
 #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;
     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 {
     Document() = default;
 
     Document(int id, double relevance, int rating)
         : id(id)
         , relevance(relevance)
         , rating(rating) {
     }
 
     int id = 0;
     double relevance = 0.0;
     int rating = 0;
 };
 
 ostream& operator<<(ostream& out, const Document& document) {
     out << "{ document_id = "s << document.id
         << ", relevance = "s << document.relevance
         << ", rating = "s << document.rating << " }"s;
     return out;
 }
 
 template <typename StringContainer>
 set<string> MakeUniqueNonEmptyStrings(const StringContainer& strings) {
     set<string> non_empty_strings;
     for (const string& str : strings) {
         if (!str.empty()) {
             non_empty_strings.insert(str);
         }
     }
     return non_empty_strings;
 }
 
 enum class DocumentStatus {
     ACTUAL,
     IRRELEVANT,
     BANNED,
     REMOVED,
 };
 
 class SearchServer {
 public:
     template <typename StringContainer>
     explicit SearchServer(const StringContainer& stop_words)
         : stop_words_(MakeUniqueNonEmptyStrings(stop_words))  // Extract non-empty stop words
     {
         if (!all_of(stop_words_.begin(), stop_words_.end(), IsValidWord)) {
             throw invalid_argument("Some of stop words are invalid"s);
         }
     }
 
     explicit SearchServer(const string& stop_words_text)
         : SearchServer(
             SplitIntoWords(stop_words_text))  // Invoke delegating constructor from string container
     {
     }
 
     void AddDocument(int document_id, const string& document, DocumentStatus status,
                      const vector<int>& ratings) {
         if ((document_id < 0) || (documents_.count(document_id) > 0)) {
             throw invalid_argument("Invalid document_id"s);
         }
         const auto words = SplitIntoWordsNoStop(document);
 
         const double inv_word_count = 1.0 / words.size();
         for (const string& word : words) {
             word_to_document_freqs_[word][document_id] += inv_word_count;
         }
         documents_.emplace(document_id, DocumentData{ComputeAverageRating(ratings), status});
         document_ids_.push_back(document_id);
     }
 
     template <typename DocumentPredicate>
     vector<Document> FindTopDocuments(const string& raw_query,
                                       DocumentPredicate document_predicate) const {
         const auto query = ParseQuery(raw_query);
 
         auto matched_documents = FindAllDocuments(query, document_predicate);
 
         sort(matched_documents.begin(), matched_documents.end(),
              [](const Document& lhs, const Document& rhs) {
                  if (abs(lhs.relevance - rhs.relevance) < 1e-6) {
                      return lhs.rating > rhs.rating;
                  } else {
                      return lhs.relevance > rhs.relevance;
                  }
              });
         if (matched_documents.size() > MAX_RESULT_DOCUMENT_COUNT) {
             matched_documents.resize(MAX_RESULT_DOCUMENT_COUNT);
         }
 
         return matched_documents;
     }
 
     vector<Document> FindTopDocuments(const string& raw_query, DocumentStatus status) const {
         return FindTopDocuments(
             raw_query, [status](int document_id, DocumentStatus document_status, int rating) {
                 return document_status == status;
             });
     }
 
     vector<Document> FindTopDocuments(const string& raw_query) const {
         return FindTopDocuments(raw_query, DocumentStatus::ACTUAL);
     }
 
     int GetDocumentCount() const {
         return documents_.size();
     }
 
     int GetDocumentId(int index) const {
         return document_ids_.at(index);
     }
 
     tuple<vector<string>, DocumentStatus> MatchDocument(const string& raw_query,
                                                         int document_id) const {
         const auto query = ParseQuery(raw_query);
 
         vector<string> matched_words;
         for (const string& word : query.plus_words) {
             if (word_to_document_freqs_.count(word) == 0) {
                 continue;
             }
             if (word_to_document_freqs_.at(word).count(document_id)) {
                 matched_words.push_back(word);
             }
         }
         for (const string& word : query.minus_words) {
             if (word_to_document_freqs_.count(word) == 0) {
                 continue;
             }
             if (word_to_document_freqs_.at(word).count(document_id)) {
                 matched_words.clear();
                 break;
             }
         }
         return {matched_words, documents_.at(document_id).status};
     }
 
 private:
     struct DocumentData {
         int rating;
         DocumentStatus status;
     };
     const set<string> stop_words_;
     map<string, map<int, double>> word_to_document_freqs_;
     map<int, DocumentData> documents_;
     vector<int> document_ids_;
 
     bool IsStopWord(const string& word) const {
         return stop_words_.count(word) > 0;
     }
 
     static bool IsValidWord(const string& word) {
         // A valid word must not contain special characters
         return none_of(word.begin(), word.end(), [](char c) {
             return c >= '\0' && c < ' ';
         });
     }
 
     vector<string> SplitIntoWordsNoStop(const string& text) const {
         vector<string> words;
         for (const string& word : SplitIntoWords(text)) {
             if (!IsValidWord(word)) {
                 throw invalid_argument("Word "s + word + " is invalid"s);
             }
             if (!IsStopWord(word)) {
                 words.push_back(word);
             }
         }
         return words;
     }
 
     static int ComputeAverageRating(const vector<int>& ratings) {
         if (ratings.empty()) {
             return 0;
         }
         int rating_sum = 0;
         for (const int rating : ratings) {
             rating_sum += rating;
         }
         return rating_sum / static_cast<int>(ratings.size());
     }
 
     struct QueryWord {
         string data;
         bool is_minus;
         bool is_stop;
     };
 
     QueryWord ParseQueryWord(const string& text) const {
         if (text.empty()) {
             throw invalid_argument("Query word is empty"s);
         }
         string word = text;
         bool is_minus = false;
         if (word[0] == '-') {
             is_minus = true;
             word = word.substr(1);
         }
         if (word.empty() || word[0] == '-' || !IsValidWord(word)) {
             throw invalid_argument("Query word "s + text + " is invalid");
         }
 
         return {word, is_minus, IsStopWord(word)};
     }
 
     struct Query {
         set<string> plus_words;
         set<string> minus_words;
     };
 
     Query ParseQuery(const string& text) const {
         Query result;
         for (const string& word : SplitIntoWords(text)) {
             const auto query_word = ParseQueryWord(word);
             if (!query_word.is_stop) {
                 if (query_word.is_minus) {
                     result.minus_words.insert(query_word.data);
                 } else {
                     result.plus_words.insert(query_word.data);
                 }
             }
         }
         return result;
     }
 
     // Existence required
     double ComputeWordInverseDocumentFreq(const string& word) const {
         return log(GetDocumentCount() * 1.0 / word_to_document_freqs_.at(word).size());
     }
 
     template <typename DocumentPredicate>
     vector<Document> FindAllDocuments(const Query& query,
                                       DocumentPredicate document_predicate) const {
         map<int, double> document_to_relevance;
         for (const string& word : query.plus_words) {
             if (word_to_document_freqs_.count(word) == 0) {
                 continue;
             }
             const double inverse_document_freq = ComputeWordInverseDocumentFreq(word);
             for (const auto [document_id, term_freq] : word_to_document_freqs_.at(word)) {
                 const auto& document_data = documents_.at(document_id);
                 if (document_predicate(document_id, document_data.status, document_data.rating)) {
                     document_to_relevance[document_id] += term_freq * inverse_document_freq;
                 }
             }
         }
 
         for (const string& word : query.minus_words) {
             if (word_to_document_freqs_.count(word) == 0) {
                 continue;
             }
             for (const auto [document_id, _] : word_to_document_freqs_.at(word)) {
                 document_to_relevance.erase(document_id);
             }
         }
 
         vector<Document> matched_documents;
         for (const auto [document_id, relevance] : document_to_relevance) {
             matched_documents.push_back(
                 {document_id, relevance, documents_.at(document_id).rating});
         }
         return matched_documents;
     }
 };
 
 template <typename IteratorRanges>
 class IteratorRange {
 public:
     explicit IteratorRange(IteratorRanges begin, IteratorRanges end)
         : begin_(begin), end_(end), size_(distance(begin, end)){}
 
     IteratorRanges begin() const  {
         return begin_;
     }
     IteratorRanges end() const {
         return end_;
     }
     size_t size() const {
         return size_;
     }
 private:
     IteratorRanges begin_;
     IteratorRanges end_;
     size_t size_;
 };
 
 template <typename To_Out>
 ostream& operator<<(ostream& out, const IteratorRange<To_Out>& sheet) {
     auto i = sheet.begin();
     while(i!= sheet.end()){
         out << *i;
         ++i;
     }
     return out;
 }
 
 template <typename Paginatorr>
 class Paginator {
 public :
     Paginator(const Paginatorr& result_begin, const Paginatorr& result_end, size_t size_of_sheet){
         auto full_size = distance(result_begin, result_end);
         Paginatorr helper = result_begin;
         for (auto i = 0; i < full_size/size_of_sheet; ++i) {
             sheets.push_back(IteratorRange<Paginatorr>(helper, helper + size_of_sheet));
             helper=helper+size_of_sheet;
         }
         if (helper!= result_end) {
             sheets.push_back(IteratorRange<Paginatorr>(helper, result_end));
         }
     }
     auto begin() const {
         return sheets.begin();
     }
     auto end() const {
         return sheets.end();
     }
     size_t size() {
         return sheets.size();
     }
 private:
     vector<IteratorRange<Paginatorr>> sheets;
 };
 
 template <typename Container>
 auto Paginate(const Container& c, size_t page_size) {
     return Paginator(begin(c), end(c), page_size);
 }
 
 int main() {
     SearchServer search_server("and with"s);
     search_server.AddDocument(1, "funny pet and nasty rat"s, DocumentStatus::ACTUAL, {7, 2, 7});
     search_server.AddDocument(2, "funny pet with curly hair"s, DocumentStatus::ACTUAL, {1, 2, 3});
     search_server.AddDocument(3, "big cat nasty hair"s, DocumentStatus::ACTUAL, {1, 2, 8});
     search_server.AddDocument(4, "big dog cat Vladislav"s, DocumentStatus::ACTUAL, {1, 3, 2});
     search_server.AddDocument(5, "big dog hamster Borya"s, DocumentStatus::ACTUAL, {1, 1, 1});
     const auto search_results = search_server.FindTopDocuments("curly dog"s);
     int page_size = 2;
     const auto pages = Paginate(search_results, page_size);
     // Выводим найденные документы по страницам
     for (auto page = pages.begin(); page != pages.end(); ++page) {
         cout << *page << endl;
         cout << "Page break"s << endl;
     }
 }