From quite a long time I was trying to solve this problem [problem:225D], but I am stuck on how to create a mask for this snake and how to extract information from the mask for doing further BFS.↵
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I referred to [user:I_love_Tanya_Romanova,2015-07-22]'s solution [submission:4086309] for the same, but was unable to understand the magic behind his mask.↵
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So can someone help me understanding how to create mask for this problem.↵
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Many others have used a hash function to solve this problem. I wonder how?↵
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I referred to [user:I_love_Tanya_Romanova,2015-07-22]'s solution [submission:4086309] for the same, but was unable to understand the magic behind his mask.↵
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So can someone help me understanding how to create mask for this problem.↵
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Many others have used a hash function to solve this problem. I wonder how?↵
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