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Two Pointers
Use two pointers moving toward each other or in the same direction to solve array and string problems in O(n).
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Two PointersBeginnerIntermediateAdvancedQuestions: 1–5
Choose mode, difficulty & questions on the next screen
What You'll Practice (3 techniques)
Left/right pointersFast/slow pointersOpposite direction scan
Prerequisites
Arrays
Sorting basics
Difficulty Levels
Beginner
Core pattern recognition, fundamental approach.
Intermediate
Pattern variations, edge cases, optimization.
Advanced
Complex combinations, merge multiple patterns.