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Find subfactorial of a number | Function to find the subfactorial of the number.
Initialize variables.
Iterating over range N.
Fact variable store factorial of the i.
If count is even.
Increase the value of count by 1.
Driver Code"
Solution in Python:
assistant
#Here is code to find subfactorial of a number and the other steps required.
 def subfactorial ( N ) :
	res = 0
	fact = 1
	count = 0
	for i in range ( 1 , N + 1 ) :
		fact = fact * i
		if ( count % 2 == 0 ) :
			res = res - ( 1 / fact )
		else :
			res = res + ( 1 / fact )
		count += 1
	return fact * ( 1 + res )
if __name__ == " _ _ main _ _ " :
	N = 4
	print ( subfactorial ( N ) )