代码随想录 - Day7 - 链表

代码随想录 - Day7 - 链表

面试…很糟糕的一场面试

只做了一道题

142. 环形链表 II

一整个数学推导，代码随想录讲的很清楚
最后用快慢指针来做就好了

fast, slow = head, head
while fast != None and fast.next != None:
    slow = slow.next
    fast = fast.next.next
    if slow == fast:
        index1, index2 = fast, head
        while index1 != index2:
            index1 = index1.next
            index2 = index2.next
        return index2
return None