import time
import random
import csv
import sys

# 1. LinkedList

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



# 2. Hash Function

def hash_function(name, table_size):
    return sum(ord(c) for c in name) % table_size


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


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


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


def ht_delete(buckets, name):
    size = len(buckets)
    index = hash_function(name, size)
    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



#3. Tree function


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):
    
    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 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']
        elif 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_list_all(root):
    
    records = []
    
    def inorder_traversal(node):
        if node is not None:
            inorder_traversal(node['left'])
            records.append((node['name'], node['phone']))
            inorder_traversal(node['right'])
    
    inorder_traversal(root)
    return records