import random
import time
import csv
import sys

sys.setrecursionlimit(20000)

def ll_insert(head, name, phone):
    data = {'name': name, 'phone': phone, "next": None}

    if head is None:
        return data

    current = head
    while current:
        if current['name'] == name:
            current['phone'] = phone
            return head
        if current['next'] is None:
            last = current
        current = current['next']

    last['next'] = data
    return head


def ll_find(head, name):
    current = head
    while current:
        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']

    prev = head
    current = head['next']
    while current:
        if current['name'] == name:
            prev['next'] = current['next']
            return head
        prev = current
        current = current['next']
    return head


def ll_list_all(head):
    data_list = []
    current = head
    while current:
        data_list.append({'name': current['name'], 'phone': current['phone']})
        current = current['next']
    data_list.sort(key=lambda x: x['name'])
    return data_list


def hash_function(name, size):
    return hash(name) % size


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


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


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


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