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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.

 

Constraints:

  • 2 <= n <= 105
  • n - 1 <= connections.length <= 105
  • 0 <= ai, bi <= n - 1
  • ai != bi
  • There are no repeated connections.

class Solution { public List<List<Integer>> criticalConnections(int n, List<List<Integer>> connections) { } }