🗄️ Arrays & Hashing
The "Organizing a Closet" Chapter
Imagine you have a messy closet full of clothes. Arrays are like laying everything out in order, and Hashing is like putting labels on boxes so you can find anything instantly!
Easy
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Two Sum
Find two numbers that add up to a target
Easy
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Contains Duplicate
Check if any number appears twice
Easy
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Valid Anagram
Check if two words use the same letters
Medium
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Group Anagrams
Group words that use the same letters together
Medium
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Longest Consecutive Sequence
Find the longest chain of consecutive numbers
🎯 Brain Hack
When you see "find pairs," "check for duplicates," or "group by something" in an interview, think Hash Map! It's the superpower for O(1) lookups.