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Learn how to reverse a string using a stack, a data structure that follows the last-in, first-out principle. This article explains how to create a stack, push the characters of the string into the ...

- 注意ending index: `i == str.length - 1`, 结尾点即使没有' '也要给reverse一下最后一个词 Given an input string, reverse the string word by word. A word is defined as a sequence of non-space characters. The input string ...