human
Count quadruplets with sum K from given array | ''Function to return the number of quadruplets having given sum.
'' Initialize answer.
'' All possible first elements.
'' All possible second element.
'' Use map to find the  fourth element.
'' All possible third elements.
'' Calculate number of valid  4th elements.
'' Update the twice_count.
'' Unordered pairs.
'' Return answer.
''Driver Code.
'' Given array arr[].
'' Given sum S.
'' Function Call"
Solution in Python:

Write me a code to count quadruplets with sum K from given array and the other steps required?
assistant
#Here is code to count quadruplets with sum K from given array and the other steps required.
 def countSum ( a , n , sum ) :
	count = 0
	for i in range ( n - 3 ) :
		for j in range ( i + 1 , n - 2 , 1 ) :
			req = sum - a [ i ] - a [ j ]
			m = { }
			for k in range ( j + 1 , n , 1 ) :
				m [ a [ k ] ] = m . get ( a [ k ] , 0 ) + 1
			twice_count = 0
			for k in range ( j + 1 , n , 1 ) :
				twice_count += m . get ( req - a [ k ] , 0 )
				if ( req - a [ k ] == a [ k ] ) :
					twice_count -= 1
			count += twice_count // 2
	return count
if __name__ == ' _ _ main _ _ ' :
	arr = [ 4 , 5 , 3 , 1 , 2 , 4 ]
	S = 13
	N = len ( arr )
	print ( countSum ( arr , N , S ) )