#include <iostream>

using namespace std;

template<typename T>
class List {
public:

    struct Node { // двусвязный список состоит из узлов
        T value; // узел хранит информативную часть
        Node* next; // указатель на следующий узел в списке
        Node* prev; // указатель на предыдущий узел
    };

    List() : size(0), head(nullptr), last(nullptr) {}

    List(const List& other) : size(other.size), head(nullptr), last(nullptr) {
        if (other.head != nullptr) {
            head = new Node{ other.head->value, nullptr, nullptr };
            Node* temp = head;
            Node* other_temp = other.head;
            while (other_temp->next != nullptr) {
                other_temp = other_temp->next;
                temp->next = new Node{ other_temp->value, nullptr, temp };
                temp = temp->next;
            }
            last = temp;
        }
    }

    List(List&& other) : size(other.size), head(other.head), last(other.last) {
        other.size = 0;
        other.head = nullptr;
        other.last = nullptr;
    }

    List& operator=(const List& other) {
        if (this != &other) {
            Clear();
            if (other.head != nullptr) {
                head = new Node{ other.head->value, nullptr, nullptr };
                Node* temp = head;
                Node* other_temp = other.head;
                while (other_temp->next != nullptr) {
                    other_temp = other_temp->next;
                    temp->next = new Node{ other_temp->value, nullptr, temp };
                    temp = temp->next;
                }
                last = temp;
                size = other.size;
            }
        }
        return *this;
    }

    List& operator=(List&& other) {
        if (this != &other) {
            Clear();
            size = other.size;
            head = other.head;
            last = other.last;
            other.size = 0;
            other.head = nullptr;
            other.last = nullptr;
        }
        return *this;
    }

    void Push_front(const T& value) {
        if (size == 0) {
            last = head = new Node{ value, nullptr, nullptr };
            size++;
            return;
        }
        Node* temp = new Node{ value, head, nullptr };
        head->prev = temp;
        head = temp;
        size++;
    }

    void Push_back(const T& value) {
        if (size == 0) {
            last = head = new Node{ value, nullptr, nullptr };
            size++;
            return;
        }
        Node* temp = new Node{ value, nullptr, last };
        last->next = temp;
        last = temp;
        size++;
    }

    void Pop_front() {
        if (size > 0) {
            if (size == 1) {
                delete head;
                last = head = nullptr;
                size--;
                return;
            }
            head = head->next;
            delete head->prev;
            head->prev = nullptr;
            size--;
        }
    }

    void Pop_back() {
        if (size > 0) {
            if (size == 1) {
                delete head;
                last = head = nullptr;
                size--;
                return;
            }
            last = last->prev;
            delete last->next;
            last->next = nullptr;
            size--;
        }
    }

    void Insert(const int index, const int& value) {
        if (index == 0) {
            Push_front(value);
            return;
        }
        if (index == size) {
            Push_back(value);
            return;
        }
        if (index > 0 && index < size) {
            Node* temp = head;
            for (int i = 0; i < index - 1; i++) {
                temp = temp->next;
            }
            Node* node = new Node{ value, temp->next, temp };
            temp->next->prev = node;
            temp->next = node;
            size++;
        }
    }

    void Erase(const int index) {
        if (index == 0) {
            Pop_front();
            return;
        }
        if (index == size - 1) {
            Pop_back();
            return;
        }
        if (index > 0 && index < size - 1) {
            Node* temp = head;
            for (int i = 0; i < index - 1; i++) {
                temp = temp->next;
            }
            Node* buf = temp->next->next;
            delete temp->next;
            temp->next = buf;
            temp->next->prev = temp;
            size--;
        }
    }

    void Print() {
        Node* temp = head;
        while (temp != nullptr) {
            cout << temp->value << " ";
            temp = temp->next;
        }
        cout << endl;
    }

    T& Front() {
        if (head != nullptr) {
            return head->value;
        }
    }

    T& Front() const {
        if (head != nullptr) {
            return head->value;
        }
    }

    T& Back() {
        if (last != nullptr) {
            return last->value;
        }
    }

    T& Back() const {
        if (last != nullptr) {
            return last->value;
        }
    }

    int Size() const {
        return size;
    }

    void Clear() {
        while (head != nullptr) {
            Pop_front();
        }
    }

    T& operator[] (const int index) {
        if (index >= 0 && index < size) {
            Node* temp = head;
            for (int i = 0; i < index; i++) {
                temp = temp->next;
            }
            return temp->value;
        }
    }

    const T& operator[] (const int index) const {
        if (index >= 0 && index < size) {
            Node* temp = head;
            for (int i = 0; i < index; i++) {
                temp = temp->next;
            }
            return temp->value;
        }
    }

    bool operator==(const List& other) {
        if (this->size != other.size) {
            return false;
        }
        Node* temp = head;
        Node* other_temp = other.head;
        while (temp != nullptr) {
            if (temp->value != other_temp->value) {
                return false;
            }
            temp = temp->next;
            other_temp = other_temp->next;
        }
        return true;
    }

    bool operator!=(const List& other) {
        return !(*this == other);
    }

    int Find(const T& value) {
        if (size == 0) {
            return -1;
        }
        int i = 0;
        Node* temp = head;
        while (temp != nullptr && temp->value != value) {
            temp = temp->next;
            i++;
        }
        if (temp != nullptr) {
            return i;
        }
        return -1;
    }

    ~List() {
        Clear();
    }

private:
    int size = 0;
    Node* head = nullptr;
    Node* last = nullptr;
};

int main() {
    List<int> list1;
    for (int i = 0; i < 10; i++) {
        list1.Push_front(i + 1);
        list1.Print();
    }
    cout << list1.Size() << endl;

    for (int i = 0; i < 3; i++) {
        list1.Pop_front();
        list1.Print();
    }
    cout << list1.Size() << endl;

    cout << "Front: " << list1.Front() << " Back: " << list1.Back() << endl;

    list1.Push_back(10);
    list1.Print();
    list1.Pop_back();
    list1.Print();

    cout << "list2: " << endl;
    List<int> list2(move(list1));
    list2.Print();

    cout << "list1: " << endl;
    list1.Print();

    list2.Insert(3, 12);
    cout << "list2: " << endl;
    list2.Print();
    list2.Erase(2);
    list2.Print();
    cout << list2.Find(12) << endl;
    cout << list2[3] << endl;
    List<int> list3(list2);
    cout << "list3: " << endl;
    list3.Print();
    list3[3] = 22;
    list3.Print();
    cout << boolalpha;
    cout << (list2 == list3) << endl;
    cout << (list2 != list3) << endl;
}