human
Longest Substring that can be made a palindrome by swapping of characters | Function to find the Longest substring that can be made a palindrome by swapping of characters.
Initialize dp array of size 1024.
Initializing mask and res.
Traverse the string.
Find the mask of the current character.
Finding the length of the longest substring in s which is a palindrome for even count.
Finding the length of the longest substring in s which is a palindrome for one odd count.
Finding maximum length of substring having one odd count.
dp [ mask ] is minimum of current i and dp [ mask ].
Return longest length of the substring which forms a palindrome with swaps.
Driver Code.
Input String.
Function Call"
Solution in Python:
assistant
#Here is code to longest Substring that can be made a palindrome by swapping of characters and the other steps required.
 def longestSubstring ( s ) :
	dp = [ 1024 for i in range ( 1024 ) ]
	res , mask = 0 , 0
	dp [ 0 ] = - 1
	for i in range ( len ( s ) ) :
		mask ^= 1 << ( ord ( s [ i ] ) - ord ( '0' ) )
		res = max ( res , i - dp [ mask ] )
		for j in range ( 10 ) :
			res = max ( res , i - dp [ mask ^ ( 1 << j ) ] )
		dp [ mask ] = min ( dp [ mask ] , i )
	return res
if __name__ == ' _ _ main _ _ ' :
	s = "3242415"
	print ( longestSubstring ( s ) )