human
Partition an array into two subsets with equal count of unique elements | Function to partition the array into two subsets such that count of unique elements in both subsets is the same.
Stores the subset number for each array elements.
Stores the count of unique array elements.
Stores the frequency of elements.
Traverse the array.
Count of elements having a frequency of 1.
Check if there exists any element with frequency > 2.
Count of elements needed to have frequency exactly 1 in each subset.
Initialize all values in the array ans [ ] as 1.
Traverse the array ans [ ].
This array element is a part of first subset.
Half array elements with frequency 1 are part of the second subset.
If count of elements is exactly 1 are odd and has no element with frequency > 2.
If count of elements that occurs exactly once are even.
Print the result.
If the count of elements has exactly 1 frequency are odd and there is an element with frequency greater than 2.
Print the result.
Driver Codea"
How can the above be solved in Python?
 ... Give me a code to partition an array into two subsets with equal count of unique elements and the other steps required?
assistant
#Here is code to partition an array into two subsets with equal count of unique elements and the other steps required.
 def arrayPartition ( a , n ) :
	ans = [ 0 ] * n
	cnt = 0
	ind , flag = 0 , 0
	mp = { }
	for i in a :
		mp [ i ] = mp . get ( i , 0 ) + 1
	for i in range ( n ) :
		if ( ( a [ i ] in mp ) and mp [ a [ i ] ] == 1 ) :
			cnt += 1
		if ( mp [ a [ i ] ] > 2 and flag == 0 ) :
			flag = 1
			ind = i
	p = ( cnt + 1 ) // 2
	ans1 = 0
	for i in range ( n ) :
		ans [ i ] = 1
	for i in range ( n ) :
		if ( ( a [ i ] in mp ) and mp [ a [ i ] ] == 1 and ans1 < p ) :
			ans [ i ] = 1
			ans1 += 1
		elif ( ( a [ i ] in mp ) and mp [ a [ i ] ] == 1 ) :
			ans [ i ] = 2
	if ( cnt % 2 == 1 and flag == 0 ) :
		print ( - 1 )
		return
	if ( cnt % 2 == 0 ) :
		print ( * ans )
	else :
		for i in range ( n ) :
			if ( ind == i ) :
				print ( 2 , end = " ▁ " )
			else :
				print ( ans [ i ] , end = " ▁ " )
if __name__ == ' _ _ main _ _ ' :
	arr = [ 1 , 1 , 2 , 3 , 4 , 4 ]
	N = len ( arr )
	arrayPartition ( arr , N )