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怎么会写500行呢？ 我只有110行我建了一个跟方向有关的数组， 感觉还能用。
int dir[4] = {0,1,2,3};//north east south, west
int stepy[4] = {0,1,0,-1};
int stepx[4] = {-1,0,1,0};
向左走, 方向-1, 向右走, 方向+1. 范围限制在0--3.
--------> y
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