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不用打表计算出x在第p层的第t个,初始 (x,y) 为(p,0)
按照这个顺序每个方向走p次,同时t--,直到t==0时候结束。
int D[6][2]={
{-1,1},{-1,0},
{0,-1},{1,-1},
{1,0},{0,1}};
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