human
Maximum array sum that can be obtained after exactly k changes | Utility function to return the sum of the array elements.
Function to return the maximized sum of the array after performing the given operation exactly k times.
Sort the array elements.
Change signs of the negative elements starting from the smallest.
If a single operation has to be performed then it must be performed on the smallest positive element.
To store the index of the minimum element.
Update the minimum index.
Perform remaining operation on the smallest element.
Return the sum of the updated array.
Driver code"
How can the above be solved in Python?
assistant
#Here is code to maximum array sum that can be obtained after exactly k changes and the other steps required.
 def sumArr ( arr , n ) :
	sum = 0
	for i in range ( n ) :
		sum += arr [ i ]
	return sum
def maxSum ( arr , n , k ) :
	arr . sort ( reverse = False )
	i = 0
	while ( i < n and k > 0 and arr [ i ] < 0 ) :
		arr [ i ] *= - 1
		k -= 1
		i += 1
	if ( k % 2 == 1 ) :
		min = 0
		for i in range ( 1 , n ) :
			if ( arr [ min ] > arr [ i ] ) :
				min = i
		arr [ min ] *= - 1
	return sumArr ( arr , n )
if __name__ == ' _ _ main _ _ ' :
	arr = [ - 5 , 4 , 1 , 3 , 2 ]
	n = len ( arr )
	k = 4
	print ( maxSum ( arr , n , k ) )