human
Minimize steps to form string S from any random string of length K using a fixed length subsequences | ''Function to find the minimum number of string required to generate the original string.
'' Stores the frequency of each  character of String S.
'' Stores the frequency of each  character of String S.
'' Count unique characters in S.
'' If unique characters is greater  then N, then return -1.
'' Otherwise.
'' Perform Binary Search.
'' Find the value of mid.
'' Iterate over the range  [0, 26].
'' If the amount[i] is  greater than 0.
'' Update the ranges.
'' Find the resultant string.
Generate the subsequence.
' ' ▁ If ▁ the ▁ length ▁ of ▁ resultant ▁ ▁ string ▁ is ▁ less ▁ than ▁ N ▁ than ▁ ▁ add ▁ a ▁ character ▁ ' a ' .
'' Print the string.
''Driver code"
How can the above be solved in Python?
 ... Give me a code to minimize steps to form string S from any random string of length K using a fixed length subsequences and the other steps required?
assistant
#Here is code to minimize steps to form string S from any random string of length K using a fixed length subsequences and the other steps required.
 def findString ( S , N ) :
	amounts = [ 0 ] * 26
	for i in range ( len ( S ) ) :
		amounts [ ord ( S [ i ] ) - 97 ] += 1
	count = 0
	for i in range ( 26 ) :
		if amounts [ i ] > 0 :
			count += 1
	if count > N :
		print ( " - 1" )
	else :
		ans = " "
		high = 100001
		low = 0
		while ( high - low ) > 1 :
			total = 0
			mid = ( high + low ) // 2
			for i in range ( 26 ) :
				if amounts [ i ] > 0 :
					total += ( amounts [ i ] - 1 ) // mid + 1
			if total <= N :
				high = mid
			else :
				low = mid
		print ( high , end = " ▁ " )
		total = 0
		for i in range ( 26 ) :
			if amounts [ i ] > 0 :
				total += ( amounts [ i ] - 1 ) // high + 1
				for j in range ( ( amounts [ i ] - 1 ) // high + 1 ) :
					ans += chr ( i + 97 )
		for i in range ( total , N ) :
			ans += ' a '
		ans = ans [ : : - 1 ]
		print ( ans )
S = " toffee "
K = 4
findString ( S , K )