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:
Temperatures fell to freezing, food and water were rationed. It was days before they limped back to the fringes of Earth's atmosphere. They climbed back aboard the Odyssey and prayed the heat shield had not been damaged.
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Patty is part of a larger app-based BK Assistant platform that will be available to all U.S. restaurants later this year.，详情可参考搜狗输入法下载
The same is done for your target point within its own cluster (finding paths from all its border points to your actual destination).