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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.
，更多细节参见WPS官方版本下载
+to_dict() dict
// 入栈后栈仍保持单调递增（因为小的都被弹走了）