1192. Critical Connections in a Network

https://leetcode.com/problems/critical-connections-in-a-network

Description

There are n servers numbered from 0 to n - 1 connected by undirected server-to-server connections forming a network where connections[i] = [ai, bi] represents a connection between servers ai and bi. Any server can reach other servers directly or indirectly through the network.

A critical connection is a connection that, if removed, will make some servers unable to reach some other server.

Return all critical connections in the network in any order.

Example 1:

**Input:** n = 4, connections = [[0,1],[1,2],[2,0],[1,3]]
**Output:** [[1,3]]
**Explanation:** [[3,1]] is also accepted.

Example 2:

**Input:** n = 2, connections = [[0,1]]
**Output:** [[0,1]]

Constraints:

• 2 <= n <= 105

• n - 1 <= connections.length <= 105

• 0 <= ai, bi <= n - 1

• ai != bi

• There are no repeated connections.

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