导航：
邻接矩阵：https://www.luogu.com.cn/blog/388651/guan-yu-lin-jie-ju-zhen 邻接链表：https://www.luogu.com.cn/blog/388651/guan-yu-lin-jie-lian-biao 链式前向星：https://www.luogu.com.cn/blog/388651/guan-yu-lian-shi-qian-xiang-xing
邻接矩阵：https://www.luogu.com.cn/blog/388651/guan-yu-lin-jie-ju-zhen
邻接链表：https://www.luogu.com.cn/blog/388651/guan-yu-lin-jie-lian-biao
链式前向星：https://www.luogu.com.cn/blog/388651/guan-yu-lian-shi-qian-xiang-xing
