LeetCode:Reverse Words in a String

Reverse Words in a String

Total Accepted: 102953 Total Submissions: 655369 Difficulty: Medium

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.

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 (M) Reverse Words in a String II

思路：

s中两边可能有空格，单词之间可能有多个空格，这些都需要去掉。

用正则表达式就是爽~~~

java code:

public class Solution {    public String reverseWords(String s) {                String[] strs = s.trim().split("\\s+");                String ans = "";        for(int i=strs.length-1;i>=0;i--) {            if(i!=0)                ans += strs[i]+" ";            else                ans += strs[i];        }                return ans;            }}