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leetcode: Reverse Words in a String

时间:2016-07-13 02:23:52      阅读:219      评论:0      收藏:0      [点我收藏+]

问题描述:

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

For example,
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.

click to show clarification.

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.

原问题链接:https://leetcode.com/problems/reverse-words-in-a-string/

?

问题分析

  这个问题的思路其实比较简单,因为它只是要把一个字符串里所有非空格的词语顺序给倒过来。那么我们就有这么一个基本的思路,首先将这个串按照空格给划分成多个非空的字符串。然后从后往前将字符串加入到一个StringBuilder中。最后去除两头的空格。当然,问题的要求里提到每个词语之间要有一个空格作为间隔,在实现的时候要注意这一点。

  详细的代码实现如下:

?

public class Solution {
    public String reverseWords(String s) {
        String[] words = s.split("\\s+");
        StringBuilder builder = new StringBuilder();
        for(int i = words.length - 1; i >= 0; i--) builder.append(words[i] + " ");
        return builder.toString().trim();
    }
}

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leetcode: Reverse Words in a String

原文:http://shmilyaw-hotmail-com.iteye.com/blog/2310241

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