有 n 个人，编号为 1 到 n。已知其中存在 m 对朋友关系，每对关系由两个编号 u 和 v 给出，表示 u 与 v 是朋友。 朋友关系是相互的，并且具有传递性：如果 A 与 B 是朋友，B 与 C 是朋友，那么 A 与 C 也属于同一个朋友圈。也就是说，只要两个人能通过若干条朋友 ...

给定一个包含 (n) 个结点、(m) 条边的有向图，结点编号为 (1) 到 (n)。每条边都有一个整数边权，边权可能为负数。请判断整个图中是否存在负权环。 负权环是指一个至少包含一条边的有向环，其环上所有边的边权之和严格小于 (0)。自环也被视为环。负权环可以 ...

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