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 main.cpp
 -----------------------------------------------------------------------
 #include "transport_catalogue.h"
 #include "input_reader.h"
 #include "stat_reader.h"
 
 using namespace std;
 
 int main() {
     TransportCatalogue catalogue;
     input_(catalogue);
     output_(catalogue);
 }
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 geo.h
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 #pragma once
 #include <cmath>
 
 struct Coordinates {
     double latitude;
     double longitude;
 
     bool operator==(const Coordinates& other) const {
         return latitude == other.latitude
             && longitude == other.longitude;
     }
 };
 
 inline double ComputeDistance(Coordinates start, Coordinates end) {
     using namespace std;
     if (!(start == end)) {
         const double dr = 3.1415926535 / 180.;
         return acos(sin(start.latitude * dr) * sin(end.latitude * dr)
                     + cos(start.latitude * dr) * cos(end.latitude * dr)
                     * cos(abs(start.longitude - end.longitude) * dr)) * 6371000;
     } else {
         return 0.0;
     }
 }
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 input_reader.h
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 #pragma once
 #include "transport_catalogue.h"
 
 Stop split_stop(std::string_view str);
 Bus split_bus(TransportCatalogue& catalogue, std::string_view str);
 void input_(TransportCatalogue& catalogue);
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 stat_reader.h
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 #pragma once
 #include "transport_catalogue.h"
 #include <algorithm>
 #include <vector>
 
 void query_stop(TransportCatalogue& catalogue, std::string_view stop_name);
 void query_(TransportCatalogue& catalogue, std::string_view str);
 void output_(TransportCatalogue& catalogue);
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 transport_catalogue.cpp
 -----------------------------------------------------------------------
 #include "transport_catalogue.h"
 
 #include <execution>
 
 void TransportCatalogue::add_stop(Stop&& stop_) {
     stops_.push_back(std::move(stop_));
     Stop* stop_buf = &stops_.back();
     stopname_to_stop.insert(StopMap::value_type(stop_buf->name_, stop_buf));
 }
 
 void TransportCatalogue::add_bus(Bus&& bus_) {
     Bus* bus_buf;
     buses_.push_back(std::move(bus_));
     bus_buf = &buses_.back();
     busname_to_bus.insert(BusMap::value_type(bus_buf->name_, bus_buf));
 
     for (Stop* _stop : bus_buf->stops_) {
         _stop->buses_.push_back(bus_buf);
     }
 }
 
 Bus* TransportCatalogue::get_bus(std::string_view _bus_name) {
     if(busname_to_bus.empty()){
         return nullptr;
     }
 
     try {
         return busname_to_bus.at(_bus_name);
     } catch(const std::out_of_range &e) {
         return nullptr;
     }
 }
 
 Stop* TransportCatalogue::get_stop(std::string_view _stop_name) {
     if(stopname_to_stop.empty()){
         return nullptr;
     }
 
     try {
         return stopname_to_stop.at(_stop_name);
     } catch(const std::out_of_range &e) {
         return nullptr;
     }
 }
 
 std::unordered_set<const Stop*> TransportCatalogue::get_uniq_stops(Bus* bus) {
     std::unordered_set<const Stop*> unique_stops_;
 
     unique_stops_.insert(bus->stops_.begin(), bus->stops_.end());
 
     return unique_stops_;
 }
 
 double TransportCatalogue::get_length(Bus* bus) {
     return transform_reduce(next(bus->stops_.begin()),
                             bus->stops_.end(),
                             bus->stops_.begin(),
                             0.0,
                             std::plus<>{},
                             [](const Stop* lhs, const Stop* rhs) {
                                 return ComputeDistance({(*lhs).latitude_,
                                                         (*lhs).longitude_}, {(*rhs).latitude_,
                                                                               (*rhs).longitude_});
                             });
 }
 
 std::unordered_set<const Bus*> TransportCatalogue::stop_get_uniq_buses(Stop* stop){
     std::unordered_set<const Bus*> unique_stops_;
 
     unique_stops_.insert(stop->buses_.begin(), stop->buses_.end());
 
     return unique_stops_;
 }
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 transport_catalogue.h
 -----------------------------------------------------------------------
 #pragma once
 #include <deque>
 #include <string>
 #include <vector>
 
 #include <iomanip>
 #include <iostream>
 
 #include <unordered_set>
 #include <unordered_map>
 
 #include "geo.h"
 
 struct Bus;
 
 struct Stop {
     std::string name_;
     double latitude_;
     double longitude_;
 
     std::vector<Bus*> buses_;
 };
 
 struct Bus {
     std::string name_;
     std::vector<Stop*> stops_;
 };
 
 typedef std::unordered_map<std::string_view , Stop*> StopMap;
 typedef std::unordered_map<std::string_view , Bus*> BusMap;
 
 
 class TransportCatalogue {
 public:
     void add_bus(Bus&& bus);
     void add_stop(Stop&& stop);
 
     Bus* get_bus(std::string_view _bus_name);
     Stop* get_stop(std::string_view _stop_name);
 
     std::unordered_set<const Bus*> stop_get_uniq_buses(Stop* stop);
     std::unordered_set<const Stop*> get_uniq_stops(Bus* bus);
     double get_length(Bus* bus);
 private:
 
     std::deque<Stop> stops_;
     StopMap stopname_to_stop;
 
     std::deque<Bus> buses_;
     BusMap busname_to_bus;
 };
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 input_reader.cpp
 -----------------------------------------------------------------------
 #include "input_reader.h"
 #include "stat_reader.h"
 #include <algorithm>
 
 Stop split_stop(std::string str) {
     auto twopoint_pos = str.find(':');
     auto comma_pos = str.find(',');
     auto entry_length = 5;
     auto distance = 2;
     Stop _stop;
 
     _stop.name_ = str.substr(entry_length,
                                   twopoint_pos - entry_length);
     _stop.latitude_ = stod(str.substr(twopoint_pos + distance,
                                       comma_pos - twopoint_pos - distance));
     _stop.longitude_ = stod(str.substr(comma_pos + distance));
 
     return _stop;
 }
 
 Bus split_bus(TransportCatalogue& catalogue, std::string_view str) {
     auto entry_length = 4;
     auto distance = 2;
     auto twopoint_pos = str.find(':');
     Bus bus;
     bus.name_ = str.substr(entry_length,
                            twopoint_pos - entry_length);
 
     str = str.substr(twopoint_pos + distance);
 
     auto more_pos = str.find('>');
     if (more_pos == std::string_view::npos) {
         auto tire_pos = str.find('-');
 
         while (tire_pos != std::string_view::npos) {
             bus.stops_.push_back(catalogue.get_stop(str.substr(0, tire_pos - 1)));
 
             str = str.substr(tire_pos + distance);
             tire_pos = str.find('-');
         }
 
         bus.stops_.push_back(catalogue.get_stop(str.substr(0, tire_pos - 1)));
         size_t size_ = bus.stops_.size() - 1;
 
         for (size_t i = size_; i > 0; i--) {
             bus.stops_.push_back(bus.stops_[i-1]);
         }
 
     } else {
         while (more_pos != std::string_view::npos) {
             bus.stops_.push_back(catalogue.get_stop(str.substr(0, more_pos - 1)));
 
             str = str.substr(more_pos + distance);
             more_pos = str.find('>');
         }
 
         bus.stops_.push_back(catalogue.get_stop(str.substr(0, more_pos - 1)));
     }
     return bus;
 }
 
 void input_(TransportCatalogue& catalogue) {
 
     std::string count;
     std::getline(std::cin, count);
 
     if (count != "") {
         std::string str;
         std::vector<std::string> buses;
         int amount = stoi(count);
         auto bus_distance = 3;
 
         for (int i = 0; i < amount; ++i) {
             std::getline(std::cin, str);
 
             if (str != "") {
                 auto space_pos = str.find_first_not_of(' ');
                 str = str.substr(space_pos);
 
                 if (str.substr(0, bus_distance) != "Bus") {
                     catalogue.add_stop(split_stop(str));
                 } else {
                     buses.push_back(str);
                 }
             }
         }
 
         for (auto bus : buses) {
             catalogue.add_bus(split_bus(catalogue, bus));
         }
     }
 }
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 stat_reader.cpp
 -----------------------------------------------------------------------
 #include "stat_reader.h"
 
 void query_bus(TransportCatalogue& catalogue, std::string_view str) {
     auto entry = 4;
     str = str.substr(entry);
 
     Bus* bus = catalogue.get_bus(str);
     if (bus != nullptr) {
         std::cout << "Bus " << bus->name_ << ": "
                   << bus->stops_.size() << " stops on route, "
                   << (catalogue.get_uniq_stops(bus)).size() << " unique stops, "
                   << std::setprecision(6) << catalogue.get_length(bus) << " route length" << std::endl;
     } else {
         std::cout << "Bus " << str << ": not found" << std::endl;
     }
 }
 
 void query_stop(TransportCatalogue& catalogue, std::string_view stop_name) {
     auto entry = 5;
     stop_name = stop_name.substr(entry);
     std::unordered_set<const Bus*> unique_buses;
     std::unordered_set<std::string_view> unique_buses_name;
     std::vector <std::string> bus_name_v;
 
     Stop* stop = catalogue.get_stop(stop_name);
 
     if (stop != NULL) {
         unique_buses = catalogue.stop_get_uniq_buses(stop);
 
         if (unique_buses.size() == 0) {
             std::cout << "Stop " << stop_name << ": no buses" << std::endl;
         } else {
             std::cout << "Stop " << stop_name << ": buses ";
 
             for (const Bus* _bus : unique_buses) {
                 bus_name_v.push_back(_bus->name_);
             }
 
             std::sort(bus_name_v.begin(), bus_name_v.end());
 
             for (std::string_view _bus_name : bus_name_v) {
                 std::cout << _bus_name;
                 std::cout << " ";
             }
             std::cout << std::endl;
         }
     }
     else {
         std::cout << "Stop " << stop_name << ": not found" << std::endl;
     }
 }
 
 void query_(TransportCatalogue& catalogue, std::string_view str) {
     if (str.substr(0, 3) == "Bus") {
         query_bus(catalogue, str);
     } else if (str.substr(0, 4) == "Stop") {
         query_stop(catalogue, str);
     } else {
         std::cout << "Error query" << std::endl;
     }
 }
 
 void output_(TransportCatalogue& catalogue) {
     std::string count;
     std::getline(std::cin, count);
 
     std::string str;
     std::vector<std::string> query;
     auto amount = stoi(count);
 
     for (int i = 0; i < amount; ++i) {
         std::getline(std::cin, str);
         query.push_back(str);
     }
 
     for (auto& strr : query) {
         query_(catalogue, strr);
     }
 }