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ac了，说说我的思路看了很久的题目，然后不认识的单词竟然是字典序，这个是看了dicuss的出来的，
就很简单的dfs，不用去比较排序，在设置
move[8][2]//八个方向
就考虑一下它的顺序，这样第一找出来的那个一定是满足题意的。
move[8][2]={{-2,-1},{-2,1},{-1,-2},{-1,2},{1,-2},{1,2},{2,-1},{2,1}}
不用说为什么吧
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