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）。
1979: 现代地缘政治的起点如果不翻开历史书，很难想象今天势同水火的沙特为领导的阿拉伯国家和伊朗，在几十年前，竟然是同一个战壕里的兄弟。
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Following its discovery, it was carefully lifted out of the earth in a soil block and scanned to work out where the items were positioned, before conservation began.
Trigg said he was "battening down the hatches" and hoping that whatever is causing the situation will pass.
I don’t give much fanfare to incremental chip increases because the performance gain is usually minimal. However, the M4 is up to 30 percent faster than the M3, according to Apple. That might be noticeable to even casual users, especially as the years go on and iPadOS becomes more demanding. For power users, it’ll mean more demanding work like video editing will be noticeably quicker.