代码随想录算法训练营day7（字符串）

反转字符串中的单词

• https://leetcode.cn/problems/reverse-words-in-a-string/description/

思路

• 先将字符串s按照空格切分为列表s_list（使用s.split()）
• 再进行反转操作
• 再将列表拼接为字符串（使用' '.join(s_list)）

class Solution:def reverseWords(self, s: str) -> str:s_list = s.split()left,right = 0, len(s_list)-1while left<right:s_list[left],s_list[right] = s_list[right],s_list[left]left+=1right-=1return ' '.join(s_list)

右旋字符串

• https://kamacoder.com/problempage.php?pid=1065

思路

• 先求出字符串s的总长度length
• s_right = s[-k::]
• s_left = s[:length-k]
• 拼接：s_right+s_left

class Solution:def right_reverse(self):k = int(input())s = input()length = len(s)s_right = s[-k::]s_left = s[:length - k]print(s_right + s_left)obj = Solution()
obj.Right_reverse()