human
Longest subsequence having difference atmost K | Function to find the longest Special Sequence.
Creating a list with all 0 's of size  equal to the length of string.
Supporting list with all 0 's of size 26 since  the given string consists  of only lower case alphabets.
Converting the ascii value to list indices.
Determining the lower bound.
Determining the upper bound.
Filling the dp array with values.
Filling the max_length array with max length of subsequence till now.
return the max length of subsequence.
driver code"
How can the above be solved in Python?
 ... Can you provide a code to longest subsequence having difference atmost K and the other steps required?
assistant
#Here is code to longest subsequence having difference atmost K and the other steps required.
 def longest_subseq ( n , k , s ) :
	dp = [ 0 ] * n
	max_length = [ 0 ] * 26
	for i in range ( n ) :
		curr = ord ( s [ i ] ) - ord ( ' a ' )
		lower = max ( 0 , curr - k )
		upper = min ( 25 , curr + k )
		for j in range ( lower , upper + 1 ) :
			dp [ i ] = max ( dp [ i ] , max_length [ j ] + 1 )
		max_length [ curr ] = max ( dp [ i ] , max_length [ curr ] )
	return max ( dp )
def main ( ) :
	s = " geeksforgeeks "
	n = len ( s )
	k = 3
	print ( longest_subseq ( n , k , s ) )
main ( )