Reverse Words in a String Efficiently | Python Solution 🚀 | #Python #Coding #LeetCode

Welcome to this Python coding tutorial! In this video, we tackle the popular LeetCode problem: Reverse Words in a String. This problem challenges us to rearrange words in reverse order while ensuring proper spacing, making it a great test for string manipulation skills in Python.

🔹 Problem Breakdown:

We are given a string s containing words separated by spaces. Our goal is to reverse the order of words while removing any leading, trailing, or multiple spaces between words. The output should be a single, properly formatted sentence.

🔥 Step-by-Step Solution:

1️⃣ Splitting the String:

We use split() to break the input string into a list of words, automatically removing extra spaces.

Example:

s = " hello world "

2️⃣ Reversing the Word Order:

We call reverse() on the list to flip the order of words.

Example:

3️⃣ Joining Words Back Into a String:

We use " ".join(words) to combine the words back into a single string, ensuring a single space between words.

Example:

result = " ".join(words) # Output: "world hello"

✅ Final Code Implementation:

class Solution:
def reverseWords(self, s):
return " ".join(words) # Join words back into a single string

# Example usage:
sol = Solution()

🚀 Time Complexity Analysis:

Splitting (split()): O(n)

Reversing (reverse()): O(n)

Joining (join()): O(n)

Overall Complexity: O(n) (where n is the length of the input string)

🎯 Why This Solution is Efficient?

✅ Uses built-in Python functions for optimal performance.
✅ Avoids unnecessary loops, making it concise and readable.
✅ Handles multiple spaces correctly without extra conditions.

📌 Whether you're preparing for coding interviews, improving your string manipulation skills, or aiming to optimize your Python code, this tutorial will help you master this important coding pattern!