Given an input string, reverse the string word by word.
For example,
Given s = "
return "
Given s = "
the sky is blue
",return "
blue is sky the
".
Update (2015-02-12):
For C programmers: Try to solve it in-place in O(1) space.
For C programmers: Try to solve it in-place in O(1) space.
Round 2 solution:
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