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稠密图，点最多200+2,建议使用邻接矩阵存，用邻接表可能很绕如果自己要调式数据的话,补一句：
if(sub_x == -2 && sub_y == -2)//调试用看输出
break;
最后答案是四舍五入取整
双向图
最后补上除了地铁连接外，所有点之间的双向步行时间，别有遗漏~
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