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sock_merchant.py
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#https://www.hackerrank.com/challenges/one-month-preparation-kit-sock-merchant/problem?isFullScreen=true&h_l=interview&playlist_slugs%5B%5D=preparation-kits&playlist_slugs%5B%5D=one-month-preparation-kit&playlist_slugs%5B%5D=one-month-week-two
#!/bin/python3
import math
import os
import random
import re
import sys
#
# Complete the 'sockMerchant' function below.
#
# The function is expected to return an INTEGER.
# The function accepts following parameters:
# 1. INTEGER n
# 2. INTEGER_ARRAY ar
#
def sockMerchant(n, ar):
# Write your code here
m = dict()
pair = 0
for i in ar:
if i not in m:
m[i] = 0
m[i] += 1
if m[i] % 2 == 0:
pair += 1
return pair
if __name__ == '__main__':
fptr = open(os.environ['OUTPUT_PATH'], 'w')
n = int(input().strip())
ar = list(map(int, input().rstrip().split()))
result = sockMerchant(n, ar)
fptr.write(str(result) + '\n')
fptr.close()