[freemjstudio] WEEK 07 Solutions

reverse-linked-list/freemjstudio.py

@@ -0,0 +1,18 @@
+# Definition for singly-linked list.
+# class ListNode:
+#     def __init__(self, val=0, next=None):
+#         self.val = val
+#         self.next = next
+class Solution:
+    def reverseList(self, head: Optional[ListNode]) -> Optional[ListNode]:
+        prev= None
+        current = head
+
+        while current:
+            next_node = current.next
+            current.next = prev
+
+            prev = current
+            current = next_node
+
+        return prev