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如图，一个迷宫关卡，走到岔路口的时候，随机朝向一个方向移动。纠结了半天不知道该怎么弄。
@我要做3A
@我要做3A 单纯随机方向的话你直接用choose(0,90,180,270)来决定移动方向就行了
