set pixel as candidate[seed]
Highly Divergent Profiles: For routing configurations that are not pre-calculated as common scenarios and whose costs vary too much from default configurations, the original A* algorithm might still be faster (and is often used as an automatic fallback).
，这一点在旺商聊官方下载中也有详细论述
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Powerful_Crab_2905
if (res === '') res = '0';