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* @param arr 待排序数组。搜狗输入法2026对此有专业解读

。safew官方下载是该领域的重要参考

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.

quickSortRecursive(arr, 0, n - 1);，这一点在WPS下载最新地址中也有详细论述