In this video, we solve LeetCode 242 – Valid Anagram using an efficient Hash Map approach.
This is one of the most important string problems asked in coding interviews and is perfect for mastering frequency counting techniques.
What you will learn:
Problem Explanation (Beginner Friendly)
Intuition Behind Anagrams
Hash Map / Frequency Array Approach
Step-by-Step Dry Run
Line-by-Line Code Explanation (C++)
Time & Space Complexity
Problem Statement:
Given two strings s and t, return true if t is an anagram of s, and false otherwise.
Approach Used:
- Count frequency of characters
- Compare both strings
- Use Hash Map / Array for optimization
Time Complexity:
O(n)
Space Complexity:
O(1) (for 26 lowercase letters)
This problem is frequently asked in interviews at top companies like Google, Amazon, and Microsoft!
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Related Topics:
- Strings
- Hashing
- Arrays
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