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

sys.setrecursionlimit(20000)

REPEATS = 5
N = 10000
def ll_insert(head, name, phone):
    current = head
    prev = None
    while current is not None:
        if current['name'] == name:
            current['phone'] = phone
            return head
        prev = current
        current = current['next']
    new_node = {'name': name, 'phone': phone, 'next': None}
    if prev is None:
        return new_node
    else:
        prev['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_collect_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
def hash_function(name, size):
    total = 0
    for ch in name:
        total = (total * 31 + ord(ch)) % size
    return total

def ht_create(size=2000):
    return [None] * size

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

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

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

def ht_collect_all(buckets):
    all_records = []
    for bucket in buckets:
        current = bucket
        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