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）。
Several commercial tools have emerged to fill this gap, offering AIO tracking and monitoring services. Ahrefs introduced features for tracking AI visibility at $129 per month. SE Ranking offers similar capabilities starting at $95 monthly. First Answer provides specialized AIO tracking for $39 per month but limits you to just 10 query tests. Keyword.com offers competitive pricing with various tier options.
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Range, and number of supported devices
在专业选择上，“实用主义”成为主流。教育政策分析、健康信息学、ESG管理及网络安全等具备明确政策红利的领域，其就业率与薪资增长远高于纯学术研究型专业 [53, 55]。
This story was originally featured on Fortune.com