Фото: Amr Alfiky / Reuters
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）。
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Apple gave the iPad Air other internal upgrades by including its N1 and C1X connectivity chips. As such, this is the first iPad Air with Wi-Fi 7 support. As you might expect, 5G cellular connectivity is available as well.
Notice how we never remove deleted keys from the map. This is one drawback to CRDTs — we can only ever add information, not remove it. Although from the application’s perspective the key has been fully deleted, the underlying state still records that the key was once there. In technical terms, we say that CRDTs are monotonically increasing data structures.9
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