LeetCode 151. Reverse Words in a String[Medium]

题目地址:https://leetcode.com/problems/reverse-words-in-a-string/

题目

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

Example 1:

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Input: "the sky is blue"
Output: "blue is sky the"

Example 2:

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Input: "  hello world!  "
Output: "world! hello"
Explanation: Your reversed string should not contain leading or trailing spaces.

Example 3:

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Input: "a good   example"
Output: "example good a"
Explanation: You need to reduce multiple spaces between two words to a single space in the reversed string.

Note:

  • A word is defined as a sequence of non-space characters.
  • Input string may contain leading or trailing spaces. However, your reversed string should not contain leading or trailing spaces.
  • You need to reduce multiple spaces between two words to a single space in the reversed string.

Follow up:

For C programmers, try to solve it in-place in O(1) extra space.

解法1

思路

实现

参考资料

  1. LeetCode Reverse Words in a String 翻转字符串中的单词 - Grandyang - 博客园