Python file for finding number of pairs

maths/iterative_pair.py

@@ -0,0 +1,44 @@
+import math
+import os
+import random
+import re
+import sys
+from collections import Counter
+import doctest
+
+#
+# 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):
+    """
+    >>> sockMerchant(9, [10, 20, 20, 10, 10, 30, 50, 10, 20])
+    3
+    >>> sockMerchant(4, [1, 1, 3, 3])
+    2
+
+    """
+
+    i = 0
+    occur = Counter(ar)
+
+    for x in occur.values():
+        i += x // 2
+    return i
+
+
+if __name__ == "__main__":
+
+    n = int(input("Enter length of array:- \n").strip())
+
+    ar = list(map(int, input("Enter the elements: \n").rstrip().split()))
+
+    result = sockMerchant(n, ar)
+    print(result)
+    doctest.testmod()