From c19fa42056ae310ddf0c076f809770747667816c Mon Sep 17 00:00:00 2001
From: SavelevMI <maksim.savelev2004maksim@gmail.com>
Date: Thu, 21 May 2026 13:34:23 +0000
Subject: [PATCH] [1] Initial linked list implementation for phonebook

---
 SavelevMI/docs/data/1-st-exersize/main.py | 58 +++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 SavelevMI/docs/data/1-st-exersize/main.py

diff --git a/SavelevMI/docs/data/1-st-exersize/main.py b/SavelevMI/docs/data/1-st-exersize/main.py
new file mode 100644
index 0000000..3c84f08
--- /dev/null
+++ b/SavelevMI/docs/data/1-st-exersize/main.py
@@ -0,0 +1,58 @@
+def create_node(name, phone):
+    return {'name': name, 'phone': phone, 'next': None}
+
+def ll_insert(head, name, phone):
+    current = head
+    # Поиск существующей записи
+    while current is not None:
+        if current['name'] == name:
+            current['phone'] = phone
+            return head
+        current = current['next']
+
+    # Создание нового узла
+    new_node = create_node(name, phone)
+
+    if head is None:
+        return new_node
+
+    current = head
+    while current['next'] is not None:
+        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
+
+    # Удаление головы
+    if head['name'] == name:
+        return head['next']
+
+    prev = head
+    current = head['next']
+    while current is not None:
+        if current['name'] == name:
+            prev['next'] = current['next']
+            return head
+        prev = current
+        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 pair: pair[0])
+    return records
\ No newline at end of file