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:
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。业内人士推荐夫子作为进阶阅读
Servers in 105 countries。关于这个话题，同城约会提供了深入分析
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