ref: dd04e30867a84320194bf9f9f7724c55060e016f
parent: 366e6a5a214357bee19268314eed9d590f663246
author: qwx <qwx@sciops.net>
date: Thu Jul 7 03:53:24 EDT 2022
fix up dijkstra search code and add to path department of redundancy department, but at least it works