def llist_insert(head, name, phone):
    current = head
    while current is not None:
        if current['name'] == name:
            current['phone'] = phone
            return head
        current = current['next']
    new_node = {'name': name, 'phone': phone, 'next': None}
    if head is None:
        return new_node
    current = head
    while current['next'] is not None:
        current = current['next']
    current['next'] = new_node
    return head


def llist_find(head, name):
    current = head
    while current is not None:
        if current['name'] == name:
            return current['phone']
        current = current['next']
    return None


def llist_delete(head, name):
    if head is None:
        return None
    if head['name'] == name:
        return head['next']
    prev = head
    current = head['next']
    while current is not None:
        if current['name'] == name:
            prev['next'] = current['next']
            return head
        prev = current
        current = current['next']
    return head


def llist_get_all(head):
    entries = []
    current = head
    while current is not None:
        entries.append((current['name'], current['phone']))
        current = current['next']
    entries.sort(key=lambda x: x[0])
    return entries


BUCKET_SIZE = 1000

def ht_create():
    return [None] * BUCKET_SIZE


def ht_insert(table, name, phone):
    idx = hash(name) % len(table)
    table[idx] = llist_insert(table[idx], name, phone)
    return table


def ht_find(table, name):
    idx = hash(name) % len(table)
    return llist_find(table[idx], name)


def ht_delete(table, name):
    idx = hash(name) % len(table)
    table[idx] = llist_delete(table[idx], name)
    return table


def ht_get_all(table):
    all_entries = []
    for head in table:
        current = head
        while current is not None:
            all_entries.append((current['name'], current['phone']))
            current = current['next']
    all_entries.sort(key=lambda x: x[0])
    return all_entries


def bst_create_node(name, phone):
    return {'name': name, 'phone': phone, 'left': None, 'right': None}


def bst_insert(root, name, phone):
    if root is None:
        return bst_create_node(name, phone)
    if name == root['name']:
        root['phone'] = phone
    elif name < root['name']:
        root['left'] = bst_insert(root['left'], name, phone)
    else:
        root['right'] = bst_insert(root['right'], name, phone)
    return root


def bst_find(root, name):
    if root is None:
        return None
    if name == root['name']:
        return root['phone']
    elif name < root['name']:
        return bst_find(root['left'], name)
    else:
        return bst_find(root['right'], name)


def bst_find_min(node):
    while node['left'] is not None:
        node = node['left']
    return node


def bst_delete(root, name):
    if root is None:
        return None
    if name < root['name']:
        root['left'] = bst_delete(root['left'], name)
    elif name > root['name']:
        root['right'] = bst_delete(root['right'], name)
    else:
        if root['left'] is None:
            return root['right']
        if root['right'] is None:
            return root['left']
        min_node = bst_find_min(root['right'])
        root['name'] = min_node['name']
        root['phone'] = min_node['phone']
        root['right'] = bst_delete(root['right'], min_node['name'])
    return root


def bst_inorder_collect(root, out_list):
    if root is not None:
        bst_inorder_collect(root['left'], out_list)
        out_list.append((root['name'], root['phone']))
        bst_inorder_collect(root['right'], out_list)


def bst_get_all(root):
    result = []
    bst_inorder_collect(root, result)
    return result


if __name__ == '__main__':
    root = None
    root = bst_insert(root, "Charlie", "111-111")
    root = bst_insert(root, "Alice", "222-222")
    root = bst_insert(root, "Bob", "333-333")
    root = bst_insert(root, "Alice", "444-444")
    print(bst_find(root, "Alice"))
    print(bst_find(root, "Bob"))
    print(bst_get_all(root))
    root = bst_delete(root, "Bob")
    print(bst_get_all(root))