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）。
According to Reuters, the deal will allow Ziff Davis to focus on its core brands, including IGN, Mashable and Everyday Health. Brand consolidation appears to be the name of the game, as the company recently laid off some of Eurogamer's most experienced editors and its entire video team. That followed a rotation of editorial staff among Ziff Davis's other gaming publications, which reduced VG247 to a small, two-person gaming guides site.
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swap(&arr[low], &arr[j]);