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:
Negative net migration hasn’t definitively happened in the U.S. for almost a century, not since the Great Depression. The U.S. native-born population is also in free fall, well below the replacement rate needed to maintain population numbers in the long run. With fewer immigrant arrivals already dealing a blow to the workforce, the shrinkage of the American taxpayer base is set to further widen the country’s deficit and hurt its prospects for economic growth.
。关于这个话题，爱思助手下载最新版本提供了深入分析
不过，仅在半年以前，Kimi仍处于被巨头围剿、月活骤减、人员流失的困境之中，尤其是2025年横空出世的DeepSeek，让月之暗面不得不重新反思自己的产品策略和投放节奏。
As fewer people choose to pair up, let alone marry, it could be that our species’ mating patterns are moving closer to the natural order