added experiment

soninrv/docs/data/lab1/phonebook.py

@@ -161,4 +161,145 @@ def bst_list_all(root):
         node = stack.pop()
         result.append((node['name'], node['phone']))
         node = node['right']
-    return result
+    return result
+
+"""
+Экспериментальная часть: замер производительности трёх структур данных.
+"""
+
+import time
+import csv
+import random
+import os
+import sys
+
+sys.setrecursionlimit(30000)   # BST с отсортированными данными — глубокая рекурсия
+
+
+# ── Параметры ──────────────────────────────────────────────────────────────
+N = 10_000        # размер набора
+REPEATS = 5       # повторений каждого замера
+SEARCH_N = 100    # запросов на поиск (существующих)
+SEARCH_MISS = 10  # запросов на поиск (отсутствующих)
+DELETE_N = 50     # удалений
+
+random.seed(42)
+
+# ── Генерация данных ───────────────────────────────────────────────────────
+records_sorted = [(f"User_{i:05d}", f"+7-000-{i:07d}") for i in range(N)]
+records_shuffled = records_sorted[:]
+random.shuffle(records_shuffled)
+
+search_names_hit  = [records_sorted[i][0] for i in random.sample(range(N), SEARCH_N)]
+search_names_miss = [f"None_{i:04d}" for i in range(SEARCH_MISS)]
+search_names = search_names_hit + search_names_miss
+
+delete_names = [records_sorted[i][0] for i in random.sample(range(N), DELETE_N)]
+
+# ── Вспомогательные функции ────────────────────────────────────────────────
+
+def build_ll(records):
+    head = None
+    for name, phone in records:
+        head = ll_insert(head, name, phone)
+    return head
+
+def build_ht(records):
+    buckets = ht_create()
+    for name, phone in records:
+        ht_insert(buckets, name, phone)
+    return buckets
+
+def build_bst(records):
+    root = None
+    for name, phone in records:
+        root = bst_insert(root, name, phone)
+    return root
+
+STRUCTURES = {
+    'LinkedList': {
+        'build':  build_ll,
+        'find':   ll_find,
+        'delete': lambda ds, name: ll_delete(ds, name),   # возвращает новый head
+        'list_all': ll_list_all,
+        'mutable': False,  # ll_delete возвращает новую голову
+    },
+    'HashTable': {
+        'build':  build_ht,
+        'find':   ht_find,
+        'delete': lambda ds, name: ht_delete(ds, name),   # in-place, returns None
+        'list_all': ht_list_all,
+        'mutable': True,
+    },
+    'BST': {
+        'build':  build_bst,
+        'find':   bst_find,
+        'delete': lambda ds, name: bst_delete(ds, name),  # возвращает новый корень
+        'list_all': bst_list_all,
+        'mutable': False,
+    },
+}
+
+MODES = {
+    'shuffled': records_shuffled,
+    'sorted':   records_sorted,
+}
+
+# ── Замер ──────────────────────────────────────────────────────────────────
+
+def measure(fn, *args, repeats=REPEATS):
+    times = []
+    for _ in range(repeats):
+        t0 = time.perf_counter()
+        fn(*args)
+        times.append(time.perf_counter() - t0)
+    return times
+
+rows = [["structure", "mode", "operation", "run", "time_sec"]]
+
+for struct_name, ops in STRUCTURES.items():
+    for mode_name, records in MODES.items():
+        print(f"  {struct_name} / {mode_name} ...", flush=True)
+
+        # ── А. Вставка ──────────────────────────────────────────────────
+        insert_times = []
+        for run in range(REPEATS):
+            t0 = time.perf_counter()
+            ds = ops['build'](records)
+            insert_times.append(time.perf_counter() - t0)
+            rows.append([struct_name, mode_name, "insert", run + 1, insert_times[-1]])
+
+        # Строим структуру один раз для поиска и удаления
+        ds = ops['build'](records)
+
+        # ── Б. Поиск ────────────────────────────────────────────────────
+        def do_search(ds=ds):
+            for name in search_names:
+                ops['find'](ds, name)
+
+        search_times = measure(do_search)
+        for run, t in enumerate(search_times, 1):
+            rows.append([struct_name, mode_name, "find", run, t])
+
+        # ── В. Удаление ─────────────────────────────────────────────────
+        # Удаление изменяет структуру, поэтому каждый раз пересобираем
+        delete_times = []
+        for run in range(REPEATS):
+            ds2 = ops['build'](records)
+            t0 = time.perf_counter()
+            for name in delete_names:
+                result = ops['delete'](ds2, name)
+                if result is not None:   # ll / bst возвращают новую голову/корень
+                    ds2 = result
+            delete_times.append(time.perf_counter() - t0)
+            rows.append([struct_name, mode_name, "delete", run + 1, delete_times[-1]])
+
+        print(f"    insert avg={sum(insert_times)/REPEATS:.4f}s  "
+              f"find avg={sum(search_times)/REPEATS:.4f}s  "
+              f"delete avg={sum(delete_times)/REPEATS:.4f}s")
+
+
+with open("results.csv", "w", newline="", encoding="utf-8") as f:
+    csv.writer(f).writerows(rows)
+
+print("\nРезультаты сохранены в docs/data/results.csv")