romanovpv/task 1/linked_list.py

@@ -1,12 +1,44 @@
+def ll_create_node(name, phone):
+    return {'name': name, 'phone': phone}
+
 def ll_insert(head, name, phone):
-    {'name': name, 'phone': phone}
-    pass
+    if head is None:
+        return ll_create_node(name, phone)
+    current = head
+    while current:
+        if current ['name'] == name:
+            current['phone'] = phone
+            return head
+        if current ['next'] is None:
+            break
+        current = current['next']
+    current['next'] = ll_create_node(name, phone)
+    return head
 
 def ll_find(head, name):
-    pass
+    current = head
+    while current:
+        if current['name'] == name:
+            return current['phone']
+        current = current['next']
+    return None
 
 def ll_delete(head, name):
-    pass
-
+    if head is None:
+        return None
+    if head['name'] == name:
+        return head['next']
+    
+    current = head
+    while current['next']:
+        if current['next']['name'] == name:
+            current['next'] = current['next']['next']
+            return head
+        
 def ll_list_all(head):
-    pass
+    items = []
+    current = head
+    while current:
+        items.append((current['name'], current['phone']))
+        current = current['next']
+    return sorted(items, key=lambda x:x[0])