LeetCode 151: Reverse Words in a String | Java Solution | Two-Pointer Approach
📝 A simple yet tricky #string manipulation problem where we need to reverse the order of words in a string while removing extra spaces. #leetcode #java #stringmanipulation
⏱️ **Time Complexity**: O(n)
🗂️ **Space Complexity**: O(n)
Timestamps:
00:00 - Understanding problem statement
00:50 - Using String Manipulation
01:57 - Big O notation explained
02:16 - Java solution walk-through
02:47 - Solution analysis - runtime + memory
Key Concepts:
String manipulation
Two-pointer technique
In-place operations
Character array processing
Space management in strings
Main Learning Points:
How to efficiently reverse words without using built-in split functions
Managing whitespace in string manipulation problems
Implementing in-place string operations for optimal space complexity
Handling edge cases in string processing
Related Problems:
LeetCode 186: Reverse Words in a String II
LeetCode 557: Reverse Words in a String III
LeetCode 344: Reverse String
LeetCode 58: Length of Last Word
Target Audience:
This video is perfect for intermediate programmers preparing for coding interviews, especially those focused on string manipulation questions at companies like Amazon, Microsoft, and Facebook.
Prerequisites:
Basic Java knowledge
Understanding of string operations
Familiarity with array manipulation
Useful Links:
LeetCode problem: https://leetcode.com/problems/reverse...
Solution code: https://leetcode.com/problems/reverse...
Additional Tips:
💡 Watch out for leading, trailing, and multiple spaces between words
💡 Consider using StringBuilder for better performance in production code
💡 This problem tests your ability to handle edge cases in string processing
Call to Action:
If you found this solution helpful, please like and subscribe for more coding interview preparation videos! Share your approach or questions in the comments below. #codinginterview #algorithmpractice #javaprogramming
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