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📜 WAYPOINT LESSON

Checkpoint: the sandwich count

⭐⭐⭐ advanced⏳ 20 min read📍 Lesson 212 of 256

Window-of-three scanning with an exact equality pattern.

Window problems look innocent and punish the boundaries: the loop runs from 1 to length - 2 (inclusive), and both window edges are compared to the middle. Write the window indexes in the margin before coding.