摘要：Test for Job Mr.Dog was fired by his company. In order to support his family, he must find a new job as soon as possible. Nowadays, It's hard to have 阅读全文

摘要：Delete 题目描述 给定一张n个点，m条边的带权有向无环图，同时给定起点S和终点T，一共有q个询问，每次询问删掉某个点和所有与它相连的边之后S到T的最短路，询问之间互相独立(即删除操作在询问结束之后会立即撤销)，如果删了那个点后不存在S到T的最短路，则输出-1。 输入描述: 第一行四个正整数表示 阅读全文