leetcode - [1]Reverse Words in a String

Question: Reverse Words in a String

Given an input string, reverse the string word by word.

For example,
Given s = "the sky is blue",
return "blue is sky the".

Clarification:

What constitutes a word?
A sequence of non-space characters constitutes a word.
Could the input string contain leading or trailing spaces?
Yes. However, your reversed string should not contain leading or trailing spaces.
How about multiple spaces between two words?
Reduce them to a single space in the reversed string.

思路：每个单词按顺序翻转，组合每个单词，对组合的句子再翻转。

例子： s = "ab cd"

<1>s的单词翻转后是"ba dc",记为_s

<2>将_s再翻转后是"cd ab"

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