Leetcode Daily | 22–09–22 | Reverse Words in a String III

2 min readSep 22, 2022

Level- Easy

Question

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

Example 1:

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

Example 2:

Input: s = "God Ding"
Output: "doG gniD"

Approach

So the question is quite simple. All you need to do is reverse each word in the sentence while preserving their order.

Use C++ stringstream class and getline function.
The getline function will run for n times, where n is the number of words in string separated by space.
We will reverse each of those words and add them to our answer.

C++ Code

class Solution {
public:
    string reverseWords(string s) {
        stringstream ss(s);
        string t, ans;
        
        while (getline(ss, t, ' ')) {
            reverse(t.begin(), t.end());
            ans += t + ' ';
        }
        // We will take substring of one less size as there will be space after last word which is not required.
        return ans.substr(0, ans.size() - 1); 
    }
};

Java Code

Python Code

class Solution:
    def reverseWords(self, s: str) -> str:
        return ' '.join(word[::-1] for word in s.split())

Output

That’s it for today’s question. Let me know if you need anything else to be there in this blog. Thank you💕