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Explicit backpressure policies
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; LAR/LSL/VERR/VERW (verification instructions)
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）。
But for many North Korea watchers, the Workers’ party congress – held over several days just once every five years – was a rare opportunity to speculate over the identity of the country’s future leader.