human
Count valid pairs in the array satisfying given conditions | Function to return total valid pairs.
Initialize count of all the elements.
frequency count of all the elements.
Add total valid pairs.
Exclude pairs made with a single element i . e . ( x , x ).
Driver Code.
Function call to print required answer"
How can the above be solved in Python?
assistant
#Here is code to count valid pairs in the array satisfying given conditions and the other steps required.
 def ValidPairs ( arr ) :
	count = [ 0 ] * 121
	for ele in arr :
		count [ ele ] += 1
	ans = 0
	for eleX , countX in enumerate ( count ) :
		for eleY , countY in enumerate ( count ) :
			if eleX < eleY :
				continue
			if ( abs ( eleX - eleY ) % 2 == 1 ) :
				continue
			ans += countX * countY
			if eleX == eleY :
				ans -= countX
	return ans
arr = [ 16 , 17 , 18 ]
print ( ValidPairs ( arr ) )