Shortcut Pre-calculation: For the most commonly used speed profiles, the travel costs (time/distance) for shortcuts between border points within each cluster are pre-calculated and stored. (Each border point effectively has an "entry" and "exit" aspect for directed travel).
cat access.log | grep "error" | sort | uniq -c。夫子对此有专业解读
// 边界处理：nums1为空时直接返回空数组（避免后续无效计算）。同城约会对此有专业解读
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