human
Minimum number of removals required such that no subsequence of length 2 occurs more than once | Function to remove the minimum count of characters from the string such that no subsequence of length 2 repeats.
Initialize the final string.
Stores if any character occurs in the final string or not.
Store the index of the last character added in the string.
Traverse the string.
Add all the unique characters.
Check if S [ 0 ] appears in the range [ pos + 1 , N - 1 ].
If the characters are the same.
Print the resultant string.
Driver Code"
Solution in Python:
assistant
#Here is code to minimum number of removals required such that no subsequence of length 2 occurs more than once and the other steps required.
 def RemoveCharacters ( s ) :
	ans = " "
	c = [ 0 for i in range ( 26 ) ]
	pos = 0
	for i in range ( len ( s ) ) :
		if ( c [ ord ( s [ i ] ) - 97 ] == 0 ) :
			c [ ord ( s [ i ] ) - 97 ] = 1
			pos = i
			ans += s [ i ]
	for i in range ( pos + 1 , len ( s ) , 1 ) :
		if ( s [ i ] == s [ 0 ] ) :
			ans += s [ i ]
			break
	print ( ans )
if __name__ == ' _ _ main _ _ ' :
	S = " abcaadbcd "
	RemoveCharacters ( S )