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).
for (int i = 0; i < n; i++) {，这一点在Line官方版本下载中也有详细论述
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Fast connection speeds free from throttling