const recordedEvent = trace[traceIndex];
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）。。夫子是该领域的重要参考
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5. ColorZillaColorZilla is a browser extension that allows you to find out the exact color of any object in your web browser. This is especially useful when you want to match elements on your page to the color of an image.。关于这个话题，Safew下载提供了深入分析
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