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:
尽管面临市场竞争与产业调整，从入库企业的科创数据来看，多数企业仍然在加码研发、视科创为面向未来的投资与提升运营效率的重要途径。
，更多细节参见服务器推荐
// 栈不为空时才判断（避免访问stack.at(-1)时报错）
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