请问
如果有四个人 A B C D
A是B的朋友
A是C的朋友
而C又是D的朋友
那D和B算不算是朋友??

bonbon

bonbon

bonbon

B<->A<->C<->D 所以我猜应该 是 ....改了 所以不是^^

所以说中间"只"夹一个人以下才算是朋友吗?

The two people will be friends if and only if thereexists a friend struct containing both of their ids.In other words, if we treat the friend struct as edges, then the problems is asking whether two vertices aredirectly connected by an edge

原先sample似乎有错OAO?

我记得P老师下课前有讲朋友的朋友算是朋友

题目的意思是说只有struct friends说是朋友的才是朋友