👫 Two Pointers

The "Bridge Crossing" Chapter

Two people walking toward each other on a bridge! Or one at start, one at end moving inward. Super efficient for sorted arrays!

Easy

Valid Palindrome

Is it the same forwards and backwards?

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Medium

3Sum

Find all triplets that sum to zero!

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Medium

Container With Most Water

Max water between two lines!

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🎯 Brain Hack

Pointers at opposite ends! For sorted arrays, start left and right, move toward center. Eliminates O(n²) to O(n)! Perfect for "two sum in sorted array"!