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剑指offer中倒数第三题出现的问题：程序可以运行，但在牛客网上报错 'NoneType' object has no attribute 'next' 不知道为什么？？ #10

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ck0712 opened this issue Sep 30, 2019 · 0 comments

ck0712 commented Sep 30, 2019

def MeetingNode(self, pHead):
    if not pHead:
        return None
    pSlow = pHead.next #定义一个慢指针2
    pFast = pSlow.next#定义一个快指针3
    while pSlow != pFast : #判断快慢指针是否相等
            pSlow = pSlow.next
            pFast=pFast.next.next
            if pFast==None:
                break
    return pSlow,pFast

当链表中没有环时，pFast.next.next最后会变成None,但是代码中没有判断pFast.next.next是否为空的条件，因此我在代码中加入了判断条件
if pFast==None:
break

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