Merge pull request #2222 from liza0525/main

[liza0525] WEEK 07 solutions

Author: liza0525

reverse-linked-list/liza0525.py

@@ -0,0 +1,8 @@
+class Solution:
+    def reverseList(self, head: Optional[ListNode]) -> Optional[ListNode]:
+        pre_node, curr_node = None, head
+        while curr_node:
+            temp = curr_node.next
+            curr_node.next = pre_node
+            pre_node, curr_node = curr_node, temp
+        return pre_node