feat(linked-list): add basic node structure and insert function
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68114824da
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136
docs/data/bst_phonebook.py
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136
docs/data/bst_phonebook.py
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import time
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import csv
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import random
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import os
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def create_node(name, phone):
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"""Создает узел BST"""
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return {'name': name, 'phone': phone, 'left': None, 'right': None}
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def bst_insert(root, name, phone):
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"""Вставляет запись в BST"""
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if root is None:
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return create_node(name, phone)
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current = root
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while True:
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if name < current['name']:
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if current['left'] is None:
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current['left'] = create_node(name, phone)
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break
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current = current['left']
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elif name > current['name']:
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if current['right'] is None:
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current['right'] = create_node(name, phone)
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break
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current = current['right']
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else:
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current['phone'] = phone
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break
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return root
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def bst_find(root, name):
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"""Ищет запись в BST"""
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current = root
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while current:
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if name == current['name']:
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return current['phone']
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elif name < current['name']:
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current = current['left']
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else:
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current = current['right']
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return None
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def bst_find_min(root):
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"""Находит минимальный узел"""
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if root is None:
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return None
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current = root
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while current['left']:
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current = current['left']
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return current
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def bst_delete(root, name):
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"""Удаляет запись из BST"""
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if root is None:
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return None
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if name < root['name']:
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root['left'] = bst_delete(root['left'], name)
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elif name > root['name']:
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root['right'] = bst_delete(root['right'], name)
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else:
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if root['left'] is None:
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return root['right']
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elif root['right'] is None:
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return root['left']
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min_node = bst_find_min(root['right'])
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root['name'] = min_node['name']
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root['phone'] = min_node['phone']
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root['right'] = bst_delete(root['right'], min_node['name'])
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return root
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def generate_test_data(n=300):
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"""Генерирует тестовые данные"""
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records = [(f"User_{i:05d}", f"123-456-{i%10000:04d}") for i in range(n)]
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records_shuffled = records.copy()
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random.shuffle(records_shuffled)
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records_sorted = sorted(records, key=lambda x: x[0])
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return records_shuffled, records_sorted
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def run_experiment():
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print("BST ТЕЛЕФОННЫЙ СПРАВОЧНИК")
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os.makedirs('docs/data', exist_ok=True)
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n = 300
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print(f"\nГенерация {n} тестовых записей...")
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records_shuffled, records_sorted = generate_test_data(n)
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results = []
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# Тест 1: Случайный порядок
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print("\n--- Тест 1: Случайный порядок ---")
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root = None
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start = time.perf_counter()
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for name, phone in records_shuffled:
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root = bst_insert(root, name, phone)
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insert_time1 = time.perf_counter() - start
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print(f"Вставка: {insert_time1:.4f} сек")
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names_to_find = [records_shuffled[i][0] for i in range(30)]
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start = time.perf_counter()
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for name in names_to_find:
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bst_find(root, name)
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find_time1 = time.perf_counter() - start
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print(f"Поиск 30 записей: {find_time1:.4f} сек")
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# Тест 2: Отсортированный порядок
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print("\n--- Тест 2: Отсортированный порядок ---")
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root = None
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start = time.perf_counter()
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for name, phone in records_sorted:
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root = bst_insert(root, name, phone)
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insert_time2 = time.perf_counter() - start
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print(f"Вставка: {insert_time2:.4f} сек")
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# Сохраняем результаты
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results.append(['BST', 'случайный', insert_time1, find_time1, 0])
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results.append(['BST', 'отсортированный', insert_time2, 0, 0])
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with open('docs/data/bst_results.csv', 'w', newline='', encoding='utf-8') as f:
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writer = csv.writer(f)
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writer.writerow(['Структура', 'Режим', 'Время_вставки', 'Время_поиска', 'Время_удаления'])
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writer.writerows(results)
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print(f"\nРезультаты сохранены в docs/data/bst_results.csv")
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print(f"\nСравнение:")
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print(f"Случайный порядок вставки: {insert_time1:.4f} сек")
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print(f"Отсортированный порядок вставки: {insert_time2:.4f} сек")
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print(f"Разница: {insert_time2/insert_time1:.1f} раз")
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if __name__ == "__main__":
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run_experiment()
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3
docs/data/bst_results.csv
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3
docs/data/bst_results.csv
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Структура,Режим,Время_вставки,Время_поиска,Время_удаления
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BST,случайный,0.0002327000256627798,1.3399985618889332e-05,0
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BST,отсортированный,0.0036721999058499932,0,0
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docs/data/compare_structures.py
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docs/data/compare_structures.py
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import csv
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import os
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def read_results(filename):
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"""Читает результаты из CSV файла"""
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results = []
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try:
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with open(filename, 'r', encoding='utf-8') as f:
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reader = csv.reader(f)
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next(reader) # Пропускаем заголовок
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for row in reader:
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results.append(row)
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except:
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print(f"Не удалось прочитать {filename}")
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return results
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def main():
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print("СРАВНЕНИЕ СТРУКТУР ДАННЫХ")
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# Читаем результаты
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linked_list = read_results('docs/data/linked_list_results.csv')
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hash_table = read_results('docs/data/hash_table_results.csv')
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bst = read_results('docs/data/bst_results.csv')
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print("\nРЕЗУЛЬТАТЫ")
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print("\nСвязный список:")
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for row in linked_list:
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print(f" {row[1]}: вставка={row[2]} сек, поиск={row[3]} сек")
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print("\nХеш-таблица:")
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for row in hash_table:
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print(f" {row[1]}: вставка={row[2]} сек, поиск={row[3]} сек")
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print("\nBST:")
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for row in bst:
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print(f" {row[1]}: вставка={row[2]} сек, поиск={row[3]} сек")
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print("ВЫВОДЫ:")
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print("1. Хеш-таблица работает быстрее всего для поиска")
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print("2. BST сильно замедляется на отсортированных данных")
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print("3. Связный список самый медленный для всех операций")
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print("4. Для частого поиска лучше использовать хеш-таблицу")
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print("5. Для отсортированных данных BST неэффективен")
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if __name__ == "__main__":
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main()
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133
docs/data/hash_table_phonebook.py
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docs/data/hash_table_phonebook.py
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import time
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import csv
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import random
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import os
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def create_node(name, phone):
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"""Создает узел для бакета"""
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return {'name': name, 'phone': phone, 'next': None}
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def ll_insert(head, name, phone):
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"""Вставка в связный список"""
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new_node = create_node(name, phone)
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if head is None:
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return new_node
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if head['name'] == name:
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head['phone'] = phone
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return head
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current = head
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while current['next']:
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if current['next']['name'] == name:
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current['next']['phone'] = phone
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return head
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current = current['next']
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current['next'] = new_node
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return head
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def ll_find(head, name):
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"""Поиск в связном списке"""
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current = head
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while current:
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if current['name'] == name:
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return current['phone']
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current = current['next']
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return None
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def ll_delete(head, name):
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"""Удаление из связного списка"""
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if head is None:
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return None
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if head['name'] == name:
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return head['next']
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current = head
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while current['next']:
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if current['next']['name'] == name:
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current['next'] = current['next']['next']
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return head
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current = current['next']
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return head
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def hash_function(name, table_size):
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"""Простая хеш-функция"""
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return sum(ord(c) for c in name) % table_size
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def ht_insert(table, name, phone):
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"""Вставка в хеш-таблицу"""
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index = hash_function(name, len(table))
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table[index] = ll_insert(table[index], name, phone)
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def ht_find(table, name):
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"""Поиск в хеш-таблице"""
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index = hash_function(name, len(table))
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return ll_find(table[index], name)
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def ht_delete(table, name):
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"""Удаление из хеш-таблицы"""
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index = hash_function(name, len(table))
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table[index] = ll_delete(table[index], name)
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def generate_test_data(n=500):
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"""Генерирует тестовые данные"""
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records = [(f"User_{i:05d}", f"123-456-{i%10000:04d}") for i in range(n)]
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random.shuffle(records)
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return records
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def run_experiment():
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print("ХЕШ-ТАБЛИЦА ТЕЛЕФОННЫЙ СПРАВОЧНИК")
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os.makedirs('docs/data', exist_ok=True)
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# Создаем хеш-таблицу
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table_size = 100
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table = [None] * table_size
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# Тестовые данные
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n = 300
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print(f"\nГенерация {n} тестовых записей...")
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records = generate_test_data(n)
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results = []
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# Вставка
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print("\n--- Тестирование ---")
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start = time.perf_counter()
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for name, phone in records:
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ht_insert(table, name, phone)
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insert_time = time.perf_counter() - start
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print(f"Вставка: {insert_time:.4f} сек")
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# Поиск
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names_to_find = [records[i][0] for i in range(50)]
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start = time.perf_counter()
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for name in names_to_find:
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ht_find(table, name)
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find_time = time.perf_counter() - start
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print(f"Поиск 50 записей: {find_time:.4f} сек")
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# Удаление
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names_to_delete = names_to_find[:25]
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start = time.perf_counter()
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for name in names_to_delete:
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ht_delete(table, name)
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delete_time = time.perf_counter() - start
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print(f"Удаление 25 записей: {delete_time:.4f} сек")
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results.append(['HashTable', 'случайный', insert_time, find_time, delete_time])
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# Сохраняем результаты
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with open('docs/data/hash_table_results.csv', 'w', newline='', encoding='utf-8') as f:
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writer = csv.writer(f)
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writer.writerow(['Структура', 'Режим', 'Время_вставки', 'Время_поиска', 'Время_удаления'])
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writer.writerows(results)
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print(f"\nРезультаты сохранены в docs/data/hash_table_results.csv")
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if __name__ == "__main__":
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run_experiment()
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122
docs/data/linked_list_phonebook.py
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122
docs/data/linked_list_phonebook.py
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import time
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import csv
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import random
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import os
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def create_node(name, phone):
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"""Создает новый узел списка"""
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return {'name': name, 'phone': phone, 'next': None}
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def ll_insert(head, name, phone):
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"""Вставляет или обновляет запись"""
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new_node = create_node(name, phone)
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if head is None:
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return new_node
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current = head
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prev = None
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while current:
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if current['name'] == name:
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current['phone'] = phone
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return head
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prev = current
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current = current['next']
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prev['next'] = new_node
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return head
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def ll_find(head, name):
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"""Ищет запись по имени"""
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current = head
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while current:
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if current['name'] == name:
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return current['phone']
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current = current['next']
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return None
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def ll_delete(head, name):
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"""Удаляет запись"""
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if head is None:
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return None
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if head['name'] == name:
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return head['next']
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current = head
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while current['next']:
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if current['next']['name'] == name:
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current['next'] = current['next']['next']
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return head
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current = current['next']
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return head
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def ll_list_all(head):
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"""Собирает все записи"""
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records = []
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current = head
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while current:
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records.append((current['name'], current['phone']))
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current = current['next']
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return sorted(records, key=lambda x: x[0])
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def generate_test_data(n=500):
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"""Генерирует тестовые данные"""
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records = [(f"User_{i:05d}", f"123-456-{i%10000:04d}") for i in range(n)]
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records_shuffled = records.copy()
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random.shuffle(records_shuffled)
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records_sorted = sorted(records, key=lambda x: x[0])
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return records_shuffled, records_sorted
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def run_experiment():
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print("LINKED LIST ТЕЛЕФОННЫЙ СПРАВОЧНИК")
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# Создаем папку для результатов
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os.makedirs('docs/data', exist_ok=True)
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# Тестовые данные
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n = 300 # Начинаем с 300 записей
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print(f"\nГенерация {n} тестовых записей...")
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records_shuffled, records_sorted = generate_test_data(n)
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results = []
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# Тестируем на случайных данных
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print("\n--- Тестирование на случайных данных ---")
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head = None
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start = time.perf_counter()
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for name, phone in records_shuffled:
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head = ll_insert(head, name, phone)
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insert_time = time.perf_counter() - start
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print(f"Вставка: {insert_time:.4f} сек")
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# Поиск
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names_to_find = [records_shuffled[i][0] for i in range(50)]
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start = time.perf_counter()
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for name in names_to_find:
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ll_find(head, name)
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find_time = time.perf_counter() - start
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print(f"Поиск 50 записей: {find_time:.4f} сек")
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# Удаление
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names_to_delete = names_to_find[:25]
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start = time.perf_counter()
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for name in names_to_delete:
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head = ll_delete(head, name)
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delete_time = time.perf_counter() - start
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print(f"Удаление 25 записей: {delete_time:.4f} сек")
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results.append(['LinkedList', 'случайный', insert_time, find_time, delete_time])
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# Сохраняем результаты
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with open('docs/data/linked_list_results.csv', 'w', newline='', encoding='utf-8') as f:
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writer = csv.writer(f)
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writer.writerow(['Структура', 'Режим', 'Время_вставки', 'Время_поиска', 'Время_удаления'])
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writer.writerows(results)
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print(f"\nРезультаты сохранены в docs/data/linked_list_results.csv")
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if __name__ == "__main__":
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run_experiment()
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