Package g1301_1400.s1319_number_of_operations_to_make_network_connected

Class Solution

java.lang.Object
g1301_1400.s1319_number_of_operations_to_make_network_connected.Solution
public class Solution extends java.lang.Object
1319 - Number of Operations to Make Network Connected.

Medium

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

You are given an initial computer network connections. You can extract certain cables between two directly connected computers, and place them between any pair of disconnected computers to make them directly connected.

Return the minimum number of times you need to do this in order to make all the computers connected. If it is not possible, return -1.

Example 1:

Input: n = 4, connections = [[0,1],[0,2],[1,2]]

Output: 1

Explanation: Remove cable between computer 1 and 2 and place between computers 1 and 3.

Example 2:

Input: n = 6, connections = [[0,1],[0,2],[0,3],[1,2],[1,3]]

Output: 2

Example 3:

Input: n = 6, connections = [[0,1],[0,2],[0,3],[1,2]]

Output: -1

Explanation: There are not enough cables.

Constraints:

  • 1 <= n <= 105
  • 1 <= connections.length <= min(n * (n - 1) / 2, 105)
  • connections[i].length == 2
  • 0 <= ai, bi < n
  • ai != bi
  • There are no repeated connections.
  • No two computers are connected by more than one cable.

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    makeConnected(int totalNumberOfComputers, int[][] connections)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • makeConnected

      public int makeConnected(int totalNumberOfComputers, int[][] connections)