Bus_stops_1

#include <bits/stdc++.h>
using namespace std;

int main() {
    int n;
    cin >> n;
    string s;
    map<string, vector<string>> buses, stops;
    for (int i = 0; i < n; i++) {
        cin >> s;
        if (s == "NEW_BUS") {
            cin >> s;
            int n;
            cin >> n;
            for (int j = 0; j < n; j++) {
                string stop;
                cin >> stop;
                buses[s].push_back(stop);
                stops[stop].push_back(s);
            }
        }
        if (s == "ALL_BUSES") {
            if (buses.empty())
                cout << "No buses" << endl;
            else {
                for (auto j : buses) {
                    cout << "Bus " << j.first << ":";
                    for (int k = 0; k < j.second.size(); k++) {
                        cout << " " << j.second[k];
                    }
                    cout << endl;
                }
            }
        }
        if (s == "STOPS_FOR_BUS") {
            cin >> s;
            if (buses.find(s) == buses.end())
                cout << "No bus" << endl;
            else {
                for (int j = 0; j < buses[s].size(); j++) {
                    string stop = buses[s][j];
                    cout << "Stop " << stop << ":";
                    if (stops[stop].size() == 1)
                        cout << " no interchange" << endl;
                    else {
                        for (int k = 0; k < stops[stop].size(); k++) {
                            if (stops[stop][k] != s)
                                cout << " " << stops[stop][k];
                        }
                        cout << endl;
                    }
                }
            }
        }
        if (s == "BUSES_FOR_STOP") {
            cin >> s;
            if (stops.find(s) == stops.end())
                cout << "No stop";
            else {
                for (int j = 0; j < stops[s].size(); j++) {
                    cout << stops[s][j] << " ";
                }
            }
            cout << endl;
        }
    }
    return 0;
}