這個題也做過,但是也忘了。
Python題解
# -*- coding:utf-8 -*-
# class ListNode:
# def __init__(self, x):
# self.val = x
# self.next = None
class Solution:
# 返回合併後列表
def Merge(self, pHead1, pHead2):
if not pHead1:
return pHead2
elif not pHead2:
return pHead1
mergedHead = None
if pHead1.val < pHead2.val:
mergedHead = pHead1
mergedHead.next = self.Merge(pHead1.next, pHead2)
else:
mergedHead = pHead2
mergedHead.next = self.Merge(pHead1, pHead2.next)
return mergedHead
考點
- 考查分析問題的能力。解決這個問題需要大量的指針操作,如果沒有透徹的分析問題形成清晰的思路,則很難寫出正確的代碼;
- 考察能不能寫出魯棒的代碼。由於有大量的指針操作,稍有不慎就會在代碼中遺留很多與魯棒性相關的隱患。