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jeff69
Dec 30th, 2016
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  1.  
  2. pair<int,int> di={{1,0},{1,1},{0,1},{-1,1},{-1,0},{-1,-1},{0,-1},{1,-1}};
  3. // if you want to rotate +45 di[i+1] is the new direction else di[i-1] , i+1=(i+1+8)%8;
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