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Maximum Edge Removal


Problem Description

Given an undirected tree with an even number of nodes. Consider each connection between a parent and child node to be an edge.

You need to remove maximum number of these edges, such that the disconnected subtrees that remain each have an even number of nodes.

Return the maximum number of edges you can remove.



Problem Constraints

2 <= A <= 105

1 <= B[i][0], B[i][1] <= A

Integer A will be even.



Input Format

First argument is an integer A denoting the number of nodes in the tree.

Second argument is a 2D array B of size (A-1) * 2, denoting the edge between nodes B[i][0] and B[i][1].



Output Format

Return an integer, denoting the maximum number of edges you can remove.



Example Input

Input 1:

 A = 6
 B = [
       [1, 2]
       [1, 3]
       [1, 4]
       [3, 5]
       [4, 6]
     ]

Input 2:

 A = 2
 B = [
       [1, 2]
     ]



Example Output

Output 1:

 2

Output 2:

 0



Example Explanation

Explanation 1:

      1
    / | \
   2  3  4
      |   \
      5    6
 Maximum number of edges we can remove is 2, i.e (1, 3) and (1, 4)

Explanation 2:

 We can't remove any edges.



NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.
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