Reverse Words in a String III

Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.

Example 1:

Input: "Let's take LeetCode contest"
Output: "s'teL ekat edoCteeL tsetnoc"

 

Note: In the string, each word is separated by single space and there will not be any extra space in the string

 

分析：将一句英文中单词倒序后输出

思路：用空格符将单词分开，倒序后再重新组装。关于单词倒序，可以先转成charArray后逆序组装，但oj会报time limit exceeded Last executed input:

即算法复杂度过高。这里JAVA中使用StringBuffer的reverse方法即可

JAVA CODE

class Solution {
    public String reverseWords(String s) {
        String[] ss = s.split(" ");
        s = "";
        for (int i = 0; i < ss.length; i++) {
            StringBuffer stringBuffer = new StringBuffer (ss[i]);
            stringBuffer = stringBuffer.reverse();
            s += stringBuffer;
            if (i != ss.length - 1)
                s += " ";
        }
        return s;
    }
}