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])
def bst_insert(root, name, phone):
    if root is None:
        return {'name': name, 'phone': phone, 'left': None, 'right': None}
    if name < root['name']:
        root['left'] = bst_insert(root['left'], name, phone)
    elif name > root['name']:
        root['right'] = bst_insert(root['right'], name, phone)
    else:
        root['phone'] = 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_min(node):
    while node and node['left']:
        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_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_list_all(root):
    records = []
    if root:
        records.extend(bst_list_all(root['left']))
        records.append((root['name'], root['phone']))
        records.extend(bst_list_all(root['right']))
    return records