// 4. 将当前索引压入栈，维护单调递减特性（供后续价格计算跨度使用）
Spencer, who is retiring after nearly 40 years at Microsoft, will be replaced by Asha Sharma - an executive who previously oversaw some of the firm's AI initiatives.
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If the A* calculation for a shortcut (in Step 3) finds it's now impassable, or if its actual detailed cost is significantly different (e.g., 20%) from the pre-calculated shortcut value:
But look at what's happening now. Someone needs information, they open ChatGPT or Claude or Perplexity, they ask a question in natural language, they receive a comprehensive answer immediately with sources cited. No clicking through multiple websites. No comparing different perspectives. No scanning search results pages. The AI synthesizes information and delivers a direct answer, fundamentally changing the discovery process.