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Level 15 · ◆◆ · ~11 min

One Pass: Two Pointers and Windows

One Pass: Two Pointers and Windows

"The family of tricks that turns a quadratic statistic into a linear one by never recomputing what you already know."

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🚀 You're jumping ahead. This builds on Binary Search Over the Answer — but play it now and you'll still earn full XP. If it feels steep, those make a gentler on-ramp.

A short lesson, then a quiz. ❤️×3 — a wrong answer costs a heart; finish with at least one left and the level is yours. Lose all three and you'll have to try again. Replay any time — XP and cleared levels are never lost.