by acacqac @ 2016-11-08 08:03:35
提供一张表：
const int pk[5][5]={
0,-1,1,1,-1,
1,0,-1,1,-1,
-1,1,0,-1,1,
-1,-1,1,0,1,
1,1,-1,-1,0
};
by pupuvovovovovo @ 2017-05-29 15:49:26
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by cn_lemon @ 2017-07-16 21:27:10