Amazon Online Assessment (OA) - DataCenter Critical Connection
Given a data center with n servers from 1 to n.
To make the data center run, all servers must be connected, which means there exists at least one path between any pair of servers.
Now we know there could be some critical connections that are broken, which brings down the whole data center.
You need to write a program to find out all these broken critical connections. A server connection is considered a critical connection, which, when removed, will make the whole data center disconnected.
Write a method to output all critical connections.
public static List<List<Integer>> findCriticalConn(int serversNum, int connectionsNum, int[][] connections)
Input
The input consists of three arguments:
serversNum, the number of servers in the data center.
connectionsNum, the number of connections between the servers.
connections, a list of pairs representing the connections between two servers.
Output
Return a list of integer pairs representing the critical connections. Output an empty array if there are no critical connections.
Examples
Example 1:
Input:
serversNum = 4
connectionsNum = 4
connections = [[1, 2], [1, 3], [3, 2], [3, 4]]
Output: [[3,4]]
Explanation:
There is one critical connection:
- Between servers
3and4If the connection[3, 4]breaks, the network will be disconnected, as servers3and4cannot communicate with the rest of the network. The remaining three connections are not critical.