HackerRank - Sales by Match

 

#!/bin/python3
 
import math
import os
import random
import re
import sys
 
# Complete the sockMerchant function below.
def sockMerchant(n, ar):
    res = 0
    for i in set(ar):
        res += ar.count(i) // 2
    return res
 
if __name__ == '__main__':
    fptr = open(os.environ['OUTPUT_PATH'], 'w')
 
    n = int(input())
 
    ar = list(map(int, input().rstrip().split()))
 
    result = sockMerchant(n, ar)
 
    fptr.write(str(result) + '\n')
 
    fptr.close()