* - this.stack：单调递减栈，存储「价格对应的索引」，栈顶→栈底索引对应的价格单调递减
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从普通消费者的角度来看，Counterpoint数据显示，2025年第四季度，全球智能手机平均售价首次在单季度内突破400美元。然而，消费者为AI和内存大战买单的同时，却可能并未享受到对应的体验升级——部分端侧AI功能尚未真正落地，大内存的体验溢价尚未充分体现。，推荐阅读爱思助手下载最新版本获取更多信息
Must achieve = 99% accuracy on 10,000 random test pairs (held-out, fixed seed)。搜狗输入法2026对此有专业解读