human
Write me a code to minimum number of elements that should be removed to make the array good and the other steps required given the following:
Minimum number of elements that should be removed to make the array good | Function to return the minimum number of elements that must be removed to make the given array good.
Count frequency of each element.
For each element check if there exists another element that makes a valid pair.
If does not exist then increment answer.
Driver Code"
How can the above be solved in Python?
assistant
#Here is code to minimum number of elements that should be removed to make the array good and the other steps required.
 def minimumRemoval ( n , a ) :
	c = dict . fromkeys ( a , 0 ) ;
	for i in range ( n ) :
		c [ a [ i ] ] += 1 ;
	ans = 0 ;
	for i in range ( n ) :
		ok = False ;
		for j in range ( 31 ) :
			x = ( 1 << j ) - a [ i ] ;
			if ( x in c and ( c [ x ] > 1 or ( c [ x ] == 1 and x != a [ i ] ) ) ) :
				ok = True ;
				break ;
		if ( not ok ) :
			ans += 1 ;
	return ans ;
if __name__ == " _ _ main _ _ " :
	a = [ 4 , 7 , 1 , 5 , 4 , 9 ] ;
	n = len ( a ) ;
	print ( minimumRemoval ( n , a ) ) ;