posToTime.set(pos, time);
return (float)rand() / RAND_MAX;，更多细节参见夫子
。谷歌浏览器【最新下载地址】是该领域的重要参考
The A Wall:* Calculating a 200-300km car route (or even shorter bicycle/pedestrian paths) could mean visiting over a million road segments, taking 10-20 seconds. For longer trips, this wait could become frustrating.
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