human
Count maximum possible pairs from an array having sum K | Function to find the maximum number of pairs with a sum K such that same element can 't be used twice.
Initialize a hashm.
Store the final result.
Iterate over the array nums [ ].
Decrement its frequency in m and increment the result by 1.
Increment its frequency by 1 if it is already present in m . Otherwise , set its frequency to 1.
Print the result.
Driver code.
Function Call"
Solution in Python:
 Give me a code to count maximum possible pairs from an array having sum K and the other steps required?
assistant
#Here is code to count maximum possible pairs from an array having sum K and the other steps required.
 def maxPairs ( nums , k ) :
	m = { }
	result = 0
	for i in nums :
		if ( ( i in m ) and m [ i ] > 0 ) :
			m [ i ] = m [ i ] - 1
			result += 1
		else :
			if k - i in m :
				m [ k - i ] += 1
			else :
				m [ k - i ] = 1
	print ( result )
arr = [ 1 , 2 , 3 , 4 ]
K = 5
maxPairs ( arr , K )