# 1. СВЯЗНЫЙ СПИСОК
def ll_create_node(name, phone):
    return {'name': name, 'phone': phone, 'next': None}


def ll_insert(head, name, phone):
    """Добавить или обновить запись. Возвращает голову списка."""
    node = head
    while node is not None:
        if node['name'] == name:
            node['phone'] = phone   # обновить
            return head
        node = node['next']
    # Вставка в начало — O(1)
    new_node = ll_create_node(name, phone)
    new_node['next'] = head
    return new_node


def ll_find(head, name):
    """Вернуть телефон или None."""
    node = head
    while node is not None:
        if node['name'] == name:
            return node['phone']
        node = node['next']
    return None


def ll_delete(head, name):
    """Удалить узел, вернуть новую голову."""
    if head is None:
        return None
    if head['name'] == name:
        return head['next']
    prev, node = head, head['next']
    while node is not None:
        if node['name'] == name:
            prev['next'] = node['next']
            return head
        prev, node = node, node['next']
    return head


def ll_list_all(head):
    """Собрать все записи и вернуть отсортированный список (name, phone)."""
    result = []
    node = head
    while node is not None:
        result.append((node['name'], node['phone']))
        node = node['next']
    result.sort(key=lambda x: x[0])
    return result

# 2. ХЕШ-ТАБЛИЦА (цепочки через связный список)

HT_SIZE = 1024   # число корзин (степень двойки)


def ht_create(size=HT_SIZE):
    return [None] * size


def _ht_hash(name, size):
    h = 5381
    for ch in name:
        h = ((h << 5) + h) ^ ord(ch)
    return h % size


def ht_insert(buckets, name, phone):
    idx = _ht_hash(name, len(buckets))
    buckets[idx] = ll_insert(buckets[idx], name, phone)


def ht_find(buckets, name):
    idx = _ht_hash(name, len(buckets))
    return ll_find(buckets[idx], name)


def ht_delete(buckets, name):
    idx = _ht_hash(name, len(buckets))
    buckets[idx] = ll_delete(buckets[idx], name)


def ht_list_all(buckets):
    result = []
    for head in buckets:
        result.extend(ll_list_all(head))
    result.sort(key=lambda x: x[0])
    return result