Leetcode 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?
Related problem: Rotate Array
解题思路:
和Leetcode Rotate Array 思路一样。
(1)reverse the whole array
(2)reverse each subarray seperated by ' '
Java code:
public class Solution { public void reverseWords(char[] s) { reverse(s, 0, s.length-1); int start = 0; for(int i = 0; i< s.length; i++){ if(s[i] == ' '){ reverse(s, start, i-1); start = i+1; } } reverse(s, start, s.length-1); } public void reverse(char[] s, int l, int r){ while(l < r){ char temp = s[l]; s[l] = s[r]; s[r] = temp; l++; r--; } } }
Reference:
1. http://www.cnblogs.com/EdwardLiu/p/4306561.html
2. https://leetcode.com/discuss/24227/my-java-solution-with-explanation
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