186. Reverse Words in a String II
# Medium
Given an input string , reverse the string word by word.
Example:
Note:
A word is defined as a sequence of non-space characters.
The input string does not contain leading or trailing spaces.
The words are always separated by a single space.
Follow up: Could you do it in-place without allocating extra space?
Key idea: reverse individual word, then reverse the whole string.
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