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Level 14 · ◆◆◆ · ~11 min

Binary Search Over the Answer

Binary Search Over the Answer

"The pattern that catches people out: you are not searching an array, you are searching the range of possible answers."

the monotone predicatesearching the answer spaceoff-by-one and the loop invariantfloating-point bisection
🚀 You're jumping ahead. This builds on Sorting, and When Not To — 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.