human
Can you provide a code to check if a Sequence is a concatenation of two permutations and the other steps required given the following:
Check if a Sequence is a concatenation of two permutations | Function to Check if a given sequence is a concatenation of two permutations or not.
Computing the sum of all the elements in the array.
Computing the prefix sum for all the elements in the array.
Iterating through the i from lengths 1 to n - 1.
Sum of first i + 1 elements.
Sum of remaining n - i - 1 elements.
Lengths of the 2 permutations.
Checking if the sums satisfy the formula or not.
Driver code"
Solution in Python:
assistant
#Here is code to check if a Sequence is a concatenation of two permutations and the other steps required.
 def checkPermutation ( arr , n ) :
	sum = 0 ;
	for i in range ( n ) :
		sum += arr [ i ] ;
	prefix = [ 0 ] * ( n + 1 ) ;
	prefix [ 0 ] = arr [ 0 ] ;
	for i in range ( n ) :
		prefix [ i ] = prefix [ i - 1 ] + arr [ i ] ;
	for i in range ( n - 1 ) :
		lsum = prefix [ i ] ;
		rsum = sum - prefix [ i ] ;
		l_len = i + 1
		r_len = n - i - 1 ;
		if ( ( ( 2 * lsum ) == ( l_len * ( l_len + 1 ) ) ) and ( ( 2 * rsum ) == ( r_len * ( r_len + 1 ) ) ) ) :
			return True ;
	return False ;
if __name__ == ' _ _ main _ _ ' :
	arr = [ 1 , 2 , 5 , 3 , 4 , 1 , 2 ]
	n = len ( arr )
	if ( checkPermutation ( arr , n ) ) :
		print ( " Yes " ) ;
	else :
		print ( " No " ) ;