import time
import csv
import random
from functools import lru_cache
from operator import index


#LinkedListPhoneBook
def create_node(name, phone):
    return {'name': name, 'phone': phone, 'next': None}

def ll_insert(head, name, phone):
    new_node = create_node(name,phone)

    if head is None:
        return new_node
    current = head
    while current['next'] is not None:
        if current['next']['name'] == name:
            new_node['next'] = current['next']['next']
            current['next']=new_node
            return head
        current=current['next']

    current['next'] = new_node
    return head

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

    current =head
    while current['next'] is not None:
        if current['next']['name'] == name:
            current['next'] = current['next']['next']
            return head
        current=current['next']

    return head

def ll_list_all(head):
    records = []
    current = head
    while current is not None:
        records.append((current['name'], current['phone']))
        current = current['next']

    records.sort(key=lambda x: x[0])
    return records

#хеш=тфблица

def create_buckets(size=1000):
    return [None] * size

def hash_function(name, buckest_size):
    hash_value = 0
    for char in name:
        hash_value = (hash_value * 31 + ord(char)) % buckest_size
    return hash_value

def ht_insert(buckets, name, phone):
    index = hash_function(name, len(buckets))
    buckets[index] = ll_insert(buckets[index], name, phone)

def ht_find(buckets, name):
    index = hash_function(name, len(buckets))
    return ll_find(buckets[index], name)

def ht_delete(buckets, name):
    index = hash_function(name, len(buckets))
    buckets[index] = ll_delete(buckets[index], name)

def ht_list_all(buckets):
    records = []
    for bucket in buckets:
        current = bucket
        while current is not None:
            records.append((current['name'], current['phone']))
            current = current['next']
    records.sort(key=lambda x:x[0])
    return records

#bts
def create_bst_node(name, phone):
    return {'name': name, 'phone': phone, 'left': None, 'right': None}

def bst_insert(root, name, phone):
    new_node = create_bst_node(name, phone)
    if root is None:
        return new_node
    current = root
    while True:
        if name == current['name']:
            current['phone'] = phone
            return root
        elif name < current['name']:
            if current['left'] is None:
                current['left'] = new_node
                return root
            current = current['left']
        else:
            if current['right'] is None:
                current['right'] = new_node
                return root
            current = current['right']


def bst_find(root, name):
    current = root
    while current is not None:
        if name == current['name']:
            return current['phone']
        elif name < current['name']:
            current=current['left']
        else:
            current=current['right']
    return None

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


def bst_delete(root, name):
    if root is None:
        return None

    if root['name'] == name:
        if root['left'] is None and root['right'] is None:
            return None
        if root['left'] is None:
            return root['right']
        if root['right'] is None:
            return root['left']
        parent = root
        min_node = root['right']
        while min_node['left']:
            parent = min_node
            min_node = min_node['left']

        root['name'] = min_node['name']
        root['phone'] = min_node['phone']


        if parent == root:
            parent['right'] = min_node['right']
        else:
            parent['left'] = min_node['right']

        return root

    parent = None
    current = root
    while current and current['name'] != name:
        parent = current
        if name < current['name']:
            current = current['left']
        else:
            current = current['right']

    if current is None:
        return root


    if current['left'] is None and current['right'] is None:
        if parent['left'] == current:
            parent['left'] = None
        else:
            parent['right'] = None


    elif current['left'] is None:
        if parent['left'] == current:
            parent['left'] = current['right']
        else:
            parent['right'] = current['right']


    elif current['right'] is None:
        if parent['left'] == current:
            parent['left'] = current['left']
        else:
            parent['right'] = current['left']

    else:
        min_parent = current
        min_node = current['right']
        while min_node['left']:
            min_parent = min_node
            min_node = min_node['left']


        current['name'] = min_node['name']
        current['phone'] = min_node['phone']


        if min_parent == current:
            min_parent['right'] = min_node['right']
        else:
            min_parent['left'] = min_node['right']

    return root


def bst_list_all(root):
    records = []
    stack = []
    current = root

    while stack or current:
        while current:
            stack.append(current)
            current = current['left']

        current = stack.pop()
        records.append((current['name'], current['phone']))
        current = current['right']

    return records

def bst_list_all(root):
    records =[]
    stack = []
    current = root
    while stack or current is not None:
        while current is not None:
            stack.append(current)
            current=current['left']

        current=stack.pop()
        records.append((current['name'], current['phone']))

        current=current['right']
    return records