数位dp总结 之 从入门到模板
https://blog.youkuaiyun.com/wust_zzwh/article/details/52100392
C++ Map常见用法说明
https://blog.youkuaiyun.com/shuzfan/article/details/53115922
最短路径问题---Floyd算法详解https://blog.youkuaiyun.com/qq_35644234/article/details/60875818
最短路径问题---Dijkstra算法详解
https://blog.youkuaiyun.com/qq_35644234/article/details/60870719
最长公共子串
https://blog.youkuaiyun.com/u013309870/article/details/69479488