Leetcode Easy


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.


class Solution {
    public String reverseWords(String s) {
        String[] split = s.split(" ");
        StringBuilder res = new StringBuilder();

        for (String cur : split) {
            StringBuilder sb = new StringBuilder(cur);
            res.append(" ");

        // Delete the trailing space
        return res.toString();

Why it works

I use a StringBuilder object to build my final string as it is considerably faster than using a String object.