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Minimum array elements required to be subtracted from either end to reduce K to 0 | Function to find the length of longest subarray having sum K.
Stores the index of the prefix sum.
Traverse the given array.
Update sum.
If the subarray starts from index 0.
Add the current prefix sum with index if it is not present in the map um.
Check if sum - K is present in Map um or not.
Update the maxLength.
Return the required maximum length.
Function to find the minimum removal of array elements required to reduce K to 0.
Stores the sum of the array.
Traverse the array arr [ ].
Update sum of the array.
Find maxLen.
If the subarray with sum doesn 't exist.
Otherwise , print the required maximum length.
Driver Code"
How can the above be solved in Python?

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What is a code to minimum array elements required to be subtracted from either end to reduce K to 0 and the other steps required?
assistant
#Here is code to minimum array elements required to be subtracted from either end to reduce K to 0 and the other steps required.
 def longestSubarray ( arr , N , K ) :
	um = { }
	sum , maxLen = 0 , 0
	for i in range ( N ) :
		sum += arr [ i ]
		if ( sum == K ) :
			maxLen = i + 1
		if ( sum not in um ) :
			um [ sum ] = i
		if ( ( sum - K ) in um ) :
			if ( maxLen < ( i - um [ sum - K ] ) ) :
				maxLen = i - um [ sum - K ]
	return maxLen
def minRequiredOperation ( arr , N , K ) :
	TotalSum = 0
	for i in range ( N ) :
		TotalSum += arr [ i ]
	maxLen = longestSubarray ( arr , N , TotalSum - K )
	if ( maxLen == - 1 ) :
		print ( - 1 , end = " " )
	else :
		print ( N - maxLen , end = " " )
if __name__ == ' _ _ main _ _ ' :
	arr = [ 1 , 3 , 1 , 1 , 2 ]
	K = 4
	N = len ( arr )
	minRequiredOperation ( arr , N , K )