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;

}
}