implemented hash table

soninrv/docs/data/lab1/phonebook.py

@@ -51,3 +51,41 @@ def ll_list_all(head):
         node = node['next']
     result.sort(key=lambda x: x[0])
     return result
+
+# 2. ХЕШ-ТАБЛИЦА (цепочки через связный список)
+
+HT_SIZE = 1024   # число корзин (степень двойки)
+
+
+def ht_create(size=HT_SIZE):
+    return [None] * size
+
+
+def _ht_hash(name, size):
+    h = 5381
+    for ch in name:
+        h = ((h << 5) + h) ^ ord(ch)
+    return h % size
+
+
+def ht_insert(buckets, name, phone):
+    idx = _ht_hash(name, len(buckets))
+    buckets[idx] = ll_insert(buckets[idx], name, phone)
+
+
+def ht_find(buckets, name):
+    idx = _ht_hash(name, len(buckets))
+    return ll_find(buckets[idx], name)
+
+
+def ht_delete(buckets, name):
+    idx = _ht_hash(name, len(buckets))
+    buckets[idx] = ll_delete(buckets[idx], name)
+
+
+def ht_list_all(buckets):
+    result = []
+    for head in buckets:
+        result.extend(ll_list_all(head))
+    result.sort(key=lambda x: x[0])
+    return result