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给一些比较关键的提示

Posted by Heart_Blue at 2023-05-27 06:00:34 on Problem 1210 
首先讲下题目背景，灰色的道路是高速公路，所有道路都是靠左行驶的。

关于从白色道路进入灰色道路，和从灰色道路离开，进入白色道路的情况
1.进入和离开横向和纵向，只能TURN LEFT
2.进入和离开斜着的道路，只能TURN SHARP LEFT
3.进入和离开圆形的灰点（一共九个），可以任意TURN（只要拐了以后有路）
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