void*need(void *x,unsigned long long length) {
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Games and physics simulations need to detect which objects are touching or overlapping. With nnn objects, checking every pair is O(n2)O(n^2)O(n2) comparisons, which gets expensive fast. A hundred objects means roughly 5,000 pair checks. A thousand means nearly 500,000.
Nature, Published online: 24 February 2026; doi:10.1038/d41586-026-00591-z
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