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DFS+BFS 坐标调得我好烦，简单思路向左：依左上右下的顺序针方向走。根据上一个来的方向判断当前坐标开始走的方向，按顺时针走即可，回溯时经过的格子数也要增加，并且方向要反向 向右：依右上左下的逆时针方向走即可 最短是普通的BFS Followed by:
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