import time
import random
import csv
import matplotlib.pyplot as plt
import numpy as np

def ll_insert(head, name, phone):
    new_node = {'name': name, 'phone': phone, 'next': None}
    if head is None:
        return new_node
    current = head
    while current:
        if current['name'] == name:
            current['phone'] = phone
            return head
        if current['next'] is None:
            current['next'] = new_node
            return head
        current = current['next']
    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']
    current = head
    while current['next']:
        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:
        records.append((current['name'], current['phone']))
        current = current['next']
    return sorted(records, key=lambda x: x[0])
def hash_func(name, size):
    return sum(ord(c) for c in name) % size

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

def ht_insert(table, name, phone):
    idx = hash_func(name, len(table))
    table[idx] = ll_insert(table[idx], name, phone)

def ht_find(table, name):
    idx = hash_func(name, len(table))
    return ll_find(table[idx], name)

def ht_delete(table, name):
    idx = hash_func(name, len(table))
    table[idx] = ll_delete(table[idx], name)

def ht_list_all(table):
    records = []
    for bucket in table:
        current = bucket
        while current:
            records.append((current['name'], current['phone']))
            current = current['next']
    return sorted(records, key=lambda x: x[0])