quickSortRecursive(arr, 0, n - 1);
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。爱思助手下载最新版本对此有专业解读
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思路：找「右侧第一个 ≤ cur」的元素 → 弹出所有 cur 的元素，栈顶即为折扣。最终价格 = cur - 折扣（有则）或 cur（无则）。
Isaacman closed out the CBS interview by saying flight-tested hardware, a revitalized work force and a more Apollo-like management strategy are only part of the story.