pass 141 easy

141-240525-pass/main.py

@@ -0,0 +1,21 @@
+# Definition for singly-linked list.
+class ListNode:
+    def __init__(self, x):
+        self.val = x
+        self.next = None
+
+# Definition for singly-linked list.
+# class ListNode:
+#     def __init__(self, x):
+#         self.val = x
+#         self.next = None
+class Solution:
+    def hasCycle(self, head: Optional[ListNode]) -> bool:
+        cnt = 0
+        if head == None: return False
+        while cnt < 1e4+10:
+            if head.next == None:
+                return False
+            head = head.next
+            cnt += 1
+        return True