[leetcode] 557. Reverse Words in a String III

题目

Given a string s, reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.

Example 1:

Input: s = "Let's take LeetCode contest"
Output: "s'teL ekat edoCteeL tsetnoc"

Example 2:

Input: s = "God Ding"
Output: "doG gniD"

Constraints:

• 1 <= s.length <= 5 * 104
• s contains printable ASCII characters.
• s does not contain any leading or trailing spaces.
• There is at least one word in s.
• All the words in s are separated by a single space.

思路

分割字符串为数组，逆转每个元素，再合并数组为字符串。

神奇算法：分割字符串为数组，逆转数组，再合并数组为字符串，再逆转字符串

代码

python版本：

class Solution:
    def reverseWords(self, s: str) -> str:
        words=[word[::-1] for word in s.split()]
        return ' '.join(words)

# 神奇算法
class Solution:
    def reverseWords(self, s: str) -> str:
        return ' '.join(s.split()[::-1])[::-1]