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）。
The BMA said the meeting on Tuesday was "informative" and the two sides had reached a "greater mutual understanding" than previously.，更多细节参见heLLoword翻译官方下载
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"The first time there's any type of struggle, the immediate thought is, 'well, I thought you were my soulmate. But maybe you're not, because soulmates aren't supposed to deal with things'," he says. "But if relationships are going to go long term, it's never just going to be a downhill run."