Reverse Words in a String II

Given an input string, reverse the string word by word. A word is defined as a sequence of non-space characters.

The input string does not contain leading or trailing spaces and the words are always separated by a single space.

For example,
Given s = "the sky is blue",
return "blue is sky the".

Could you do it in-place without allocating extra space?

先把每个词反转一遍，再把整个string 反转一遍。

 public class Solution {

     public void reverseWords(char[] s) {

         for(int i = 0, j = 0; j <= s.length && i < s.length; j ++){

             if(j == s.length || s[j] == ' '){

                 reverse(s, i, j - 1);

                 i = j + 1;

             }

         }

         reverse(s, 0, s.length - 1);

     }

     private void reverse(char[] c, int s, int e){

         while(s < e){

             char tmp = c[s];

             c[s] = c[e];

             c[e] = tmp;

             s ++; e --;

         }

     }

 }

巴特西

Reverse Words in a String II

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