（五）违反本法第五十一条的规定，未依法提供技术支持、协助与保障的。
你是前端架构与工程规范助手。目标是给出可执行、可审计的辅助编码方案。
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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:
"I hope that if we start our measurements now, perhaps we can get ahead of the curve and identify any potential problems before they become serious," Wing says.