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Easy Accuracy: 66.45% Submissions: 6002 Points: 2

Given a list of N words. Count the number of words that appear exactly twice in the list.

Example 1:

N = 3
list = {Geeks, For, Geeks}
Output: 1
Explanation: 'Geeks' is the only word that 
appears twice. 

Example 2:

N = 8
list = {Tom, Jerry, Thomas, Tom, Jerry, 
Courage, Tom, Courage}
Output: 2
Explanation: 'Jerry' and 'Courage' are the 
only words that appears twice. 

Your Task:  
You dont need to read input or print anything. Complete the function countWords() which takes integer N and list of strings as input parameters and returns the number of words that appear twice in the list.

Expected Time Complexity: O(N)
Expected Auxiliary Space: O(N)  

1<= N <= 104


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