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推廣網站開發,包含 Laravel 和 Kotlin 後端撰寫、自動化測試、讀書心得等。Taiwan Kotlin User Group 管理員。

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Hi, here’s your problem today. This problem was recently asked by Uber:

Given a linked list, determine if the linked list has a cycle in it. For notation purposes, we use an integer pos which represents the zero-indexed position where the tail connects to.


Input: head = [4,3,2,1,0], pos = 1.  
Output: true

The example indicates a list where the tail connects to the second node.

class ListNode(object):
  def __init__(self, x):
    self.val = x = None

class Solution(object):
  def hasCycle(self, head):
    # Fill this in.

testHead = ListNode(4)
node1 = ListNode(3) = node1
node2 = ListNode(2) = node2
node3 = ListNode(1) = node3
testTail = ListNode(0) = testTail = node1

# True