本程序为dijkstra算法的最核心部分，也基本上是源码，并无很大改动，用意在于大家对dijkstra算法有个宏观的理解，基本上对代码行行注释很适合新手。也提出对dijkstra算法修改的一点思路-The dijkstra algorithm core part This program is basically the source code, there are no great changes, the intention is to have a macro understanding