阿柟喜欢吃小星星？

题目题解由于题目中说如果经过从u到v的传送阵时，在v到u存在路径，那么就要损耗1点灵力值。考虑tarjan的强连通分量，在一个强连通分量中的点，必然可以互达，就会损耗灵力值。跑SPFA时由于有①灵力损耗最小②耗时最小两个限制，所以需要分开进行判断。当两个点处于同一强连通分量时，灵力损耗为dis[u] + 1，如果比dis[v]小就更新灵力和时间，如果相同就再比较时间，单独更新时间。若不处于同一强连通

DescriptionA number of schools are connected to a computer network. Agreements have been developed among those schools: each school maintains a list of schools to which it distributes software (the “re