Готови решения няма да са му от особена полза защото трябва да ги осмисли, което не е по-лесно от това сам да напише кода.

ChatGPT  може да се справи доста добре с подобни задания, както и да отговори на въпроси по кода.

Ето какво генерира като код за първата задача (даже не се наложи да му я превеждам на английски):

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

struct Excursion {
    string country;
    string city;
    int nights;
    double price;
};

int main() {
    int num_excursions;
    cout << "Enter the number of excursions: ";
    cin >> num_excursions;

    vector<Excursion> excursions;
    for (int i = 0; i < num_excursions; i++) {
        Excursion excursion;
        cout << "Enter the country: ";
        cin >> excursion.country;
        cout << "Enter the city: ";
        cin >> excursion.city;
        cout << "Enter the number of nights: ";
        cin >> excursion.nights;
        cout << "Enter the price: ";
        cin >> excursion.price;

        // Validate the price of the excursion
        if (excursion.price <= 200 || excursion.price > 1500) {
            cout << "Invalid price for excursion. Price should be in the range (200, 1500]." << endl;
            i--;
            continue;
        }

        excursions.push_back(excursion);
    }

    // Output the list of excursions
    cout << "List of excursions: " << endl;
    for (Excursion e : excursions) {
        cout << "Country: " << e.country << ", City: " << e.city << ", Nights: " << e.nights << ", Price: " << e.price << endl;
    }

    // Calculate and output the average price of excursion
    double sum = 0;
    for (Excursion e : excursions) {
        sum += e.price;
    }
    double average_price = sum / excursions.size();
    cout << "Average price of excursion: " << average_price << endl;

    // Output the excursions with prices above the average price
    cout << "Excursions with prices above the average price: " << endl;
    for (Excursion e : excursions) {
        if (e.price > average_price) {
            cout << "Country: " << e.country << ", City: " << e.city << ", Nights: " << e.nights << ", Price: " << e.price << endl;
        }
    }

    // Sort the excursions by country
    sort(excursions.begin(), excursions.end(), [](Excursion a, Excursion b) {
        return a.country < b.country;
    });

    // Output the list of excursions sorted by country
    cout << "Sorted list of excursions by country: " << endl;
    for (Excursion e : excursions) {
        cout << "Country: " << e.country << ", City: " << e.city << ", Nights: " << e.nights << ", Price: " << e.price << endl;
    }

    return 0;
}

Кодът не е идеален, но е досатъчно добра отправна точка.