题目地址：https://leetcode.com/problems/reverse-words-in-a-string/description/
题目描述
Given an input string, reverse the string word by word.
Example 1:
Input: "the sky is blue"
Output: "blue is sky the"
Example 2:
Input: " hello world! "
Output: "world! hello"
Explanation: Your reversed string should not contain leading or trailing spaces.
Example 3:
Input: "a good example"
Output: "example good a"
Explanation: You need to reduce multiple spaces between two words to a single space in the reversed string.
Note:
- A word is defined as a sequence of non-space characters.
- Input string may contain leading or trailing spaces. However, your reversed string should not contain leading or trailing spaces.
- You need to reduce multiple spaces between two words to a single space in the reversed string.
Follow up: For C programmers, try to solve it in-place in O(1) space.
题目大意
翻转字符串里面的单词。同时去掉多余的空格。
解题方法
字符串操作直接放弃 C++ ，一般都选择 Python。建议大家刷题的时候会 Python。
Python 的 split() 函数：
- split()的时候，多个连续空格当成分割符；
- split(' ')的时候，多个空格都要分割，每个空格分割出来空。
所以可以直接用split()函数，把多个连续空格当成分割符，进行分割。
然后再翻转字符串。
class Solution:
def reverseWords(self, s: str) -> str:
return " ".join(s.split()[::-1])
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