The “PCM Boundary”: a Wannabe-DRM Graveyard
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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2L decoder, d=5, 5h+1h