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"
转载于:https://www.cnblogs.com/zhuangzebo/p/3947736.html
