Create 141-Linked-List-Cycle.py

Author: neetcode-gh

141-Linked-List-Cycle.py

@@ -0,0 +1,16 @@
+# Definition for singly-linked list.
+# class ListNode:
+#     def __init__(self, x):
+#         self.val = x
+#         self.next = None
+
+class Solution:
+    def hasCycle(self, head: ListNode) -> bool:
+        slow, fast = head, head
+        
+        while fast and fast.next:
+            slow = slow.next
+            fast = fast.next.next
+            if slow == fast:
+                return True
+        return False