Adding penalties or preferences for certain roads.
Hand-coded weights (constructive proofs are valid — they show the architecture can represent addition)
。safew官方下载对此有专业解读
代码重构：它没有直接甩代码，而是先思考了“设计模式”的选择（工厂模式 vs 策略模式），最终选择了适合扩展的策略模式。
To: Larry Page, Founder and Board Member, Google