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交互式开发：支持多 Cell 类型与智能提示

swap(&arr[0], &arr[i]); // 堆顶(最大)换到末尾

，详情可参考雷电模拟器官方版本下载

Notice how the highlighted region shrinks at each step. The algorithm never examines points outside the narrowing window. In a balanced tree with nnn points, this takes about log⁡4(n)\log_4(n)log4​(n) steps. For a million points, that's roughly 10 steps instead of a million comparisons.

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