Stop recomputing from scratch. Watch a glowing caliper slide over the array, dropping what leaves and adding what enters — turning O(n²) recomputation into O(n) motion.
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🔧 CaliI'm the caliper. I only touch what changes at the edges — everything inside the window, I already know.
🐢 RexAnd I'm Rex. I recompute EVERYTHING from zero, every single time. It's... thorough. Also slow.